A lot of progress was made today and I apologize in advance for the number of photos, but the work on the interior involved many sub-assemblies and so the photos reflect that.
Step 14 is an extremely busy step with 4 different sub-assemblies, one of which has 3 sub-sub assemblies for it to be completed. The first one. labeled F1 in the instructions, deals with the base of the gun mount that will attach into the hull tub. The instructions direct you to glue part F4 to F44 and secure it in place, however I didn't do this for two reasons: 1) if left unglued, the mount can traverse left to right a few degrees and remains detachable for final fit/adjustment and 2) in later steps the seats are secured here and if left free, can be detailed (which turned out to have an added advantage as well in later steps for a bonus 3rd reason which I'll add to further down).
The next sub-assembly, labeled F2, had the 3 sub-subs dealing with many of the details for the gun sight assembly. Two of the three are pretty simple, assembling the elevation hand wheel and the sight vane, both of which deal with 2 parts only. The third on the other hand is very detailed, with 7 small and detailed parts, that come together to produce the main body of the gun sight.
The actual assembly of the sub-F2 takes some strategic thinking in the exact order due to the very small nature of some of the parts and their delicate attachment points. A "mystery" part makes its appearance labeled as F27 (F27 was already used in the sub-sub step) and doesn't actually exist on the sprues in any shape or form, so beware of that. I used a pin vise to drill out the lens face of the periscope part F28 since it was molded solid.
The other 2 sub-subs are pretty straight forward, the one labeled F3 deals with the seats for the crew, one of which is upright and the other laid flat. The upright seat has a very delicate attachment point between the seat back and the seat itself while the laid flat seat has a much sturdier attachment. They attach to the mount bar via 2 pins and these don't have a lot of surface area to hold to, so they were set off to the side to dry a good long while before handling again.
The final sub-sub is the rather ordinary right side of the gun mount.
Step 15 combines the sub-assemblies F1 and F2 from Step 14 to produce the full left side of the gun mount and sight arrangement. This is a very dense assembly, almost a kit in itself, and produces a very nice detailed arrangement for the sight.
Moving on to Step 16, this deals with the assembly of the gun breech and recoil housings. A decision needs to be made on whether or not to use the aluminum barrel or the styrene barrel since there's a molded on step that needs to be removed for the aluminum barrel to fit properly.
There's an amusing error in the instructions on this step. Part F48, the recoil housing, is mis-labeled as F549...it only seems like there's that many parts in the kit at times! The rest of the breech assembly proceeds smoothly with the usual seam lines on the breech itself needing attention. The breech block is a separate two-piece assembly and the locking arm is keyed to be in the "closed" position and requires modification if you want to show the breech open. I opted for the closed but didn't glue the block in place so it could be removed later for easier painting.
Step 17 deals with the assembly of the gun muzzle brake and the attachment of the mantlet to the breech along with the superstructure front plate. Two muzzle brake options are provided and I went with the "field" version combo of parts F49-F3-F58. The cap of the brake fits snugly and just a touch of liquid glue was needed to get it to sit properly and then sanded smooth to produce a one-piece brake. I glued it with CA gel to the aluminum barrel first since the end of the barrel has a "D" shaped mating pin, meaning the brake can only mount in one position. I glued the mantlet first to the gun breech to make sure it was lined up properly and then glued the base of the barrel with CA gel as the final step.
Then, just to make sure everything was still playing nice, I test fit the gun and front plate with the superstructure to see how it would all work out. The weight of the aluminum barrel means that either the gun will have to be fixed in a set position or else the travel lock used in the upright position to keep the barrel in position. Something to keep in mind for those who opt for the aluminum over the styrene.
Step 18 is where I started to color outside the lines since it starts in on the various details for the interior. It directs the installation of the right side periscope and since this is a clear piece, I left it off for later. It also directs the installation of the radio and junction box, both of which I assembled but set off to the side. There is a large pin hole in the roof that I also filled with some putty and sanded down. Not highly visible but there nonetheless and easily dealt with at this point. I also skipped ahead a bit and assembled and installed the side vents. After much back and forth, I decided this was the best approach to attaching them vs. to the hull tub in terms of facilitating painting the interior.
From Step 19, the interior details of the various boxes for the front area were installed. Part E29 needs to be positioned very carefully since it needs to have sufficient clearance for the superstructure front plate to sit properly. I also realized at this point the bonus #3 advantage to not gluing part F44 earlier, the seats need to be able to clear the exhaust vents to fit properly so this allowed for an easy adjustment when securing them to the base of the gun mount. A very tricky installation as they kept wanting to "roll" and droop down, but eventually they stayed put.
Step 20 deals with the installation of the ammo lockers for the right and left sides. I assembled both sets closed as they have several large pin marks on the interior and no real details on interiors of the doors or the lockers themselves beyond just the bare trays and holders, so that was easily taken care of. It's worth noting if you elect to pose them open that the smaller lockers have an interesting hinge arrangement where the top folds upward and pulls the front part with it and is secured with pins attached to the superstructure wall vs. the usual folding outward or downward type of arrangement. I again tested the arrangement of the lockers with the superstructure to make sure everything lined up properly before gluing on both sides.
As a little side note, I found my "missing" rear door hatch handles...they are on Sprue D and are parts D72 and D73. The instructions have these listed as "Not for Use" and while they may not be specifically designed for the DM, they fit perfectly into the molded in holes on the triangular latches, so they have been added as well.
For Step 22, I assembled the base and mount for the "rabbit ears" periscope and installed it on the right side. I left off the periscope itself deliberately to allow for better detailing since Lawrence Quah provided me with some nice interior photos that show the periscope wired up to the little junction box on the right side ventilator shaft and I want to do the base paint first before tackling that one. The retaining clips, E9 and E10, were added to the walls and these should go on the left side as well although the instructions never tell you to do it they magically appear in place in Step 23 and can be easily overlooked if not careful.
As the final step for the interior before painting will begin, I installed the rear plate C4 to the superstructure and added the grab handles and details which appear to be a small box of some type and a small oil can? The little can's position is a bit of a head scratcher since in the main diagram the arrows show it going in the middle of the plate but in the sub-diagram showing all the details in place, it's right next to the small box, part E23. The latter made more sense to me, so that's the one I went with.
Last but not least, a final check to make sure the gun mount and everything else fits properly. It does raise one question to me out of curiosity more than anything else...the driver's compartment seems to be open to the fighting compartment on the interior...there's no plate or blanked off area there, just a black rectangular hole. Maybe part of the original vehicle design?