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I have been working on this for the past few months. This is my attempt at the KV ZIK-20 SPG. A concept that only got as far as a wooden model. The design came out of the same program that ultimately lead to the KV-14/SU-152. The development history can be found here:ZIK-20: Assault Alternative The goal was to mount a 152mm gun into the hull of a KV-7 since that design path was a failure. It's a questionable design. Most of the ammo was stored in the floor which made it uncomfortable for the crew and the fuel tanks were mounted in the in the front corners of the casemate which would make things unfortunate for the crew. It has a crew of 6 with four crammed into the slab sided fighting compartment. I created the 3D CAD drawings in SolidWorks based on the few drawings of the ZIK-20 that are available. Most of them don't match up to one another so I had to adjust some of the features to line up. As far as I know, there is no top down drawing of the roof plate. The locations for the top hatch, vent, and rotating periscope, and fuel caps are interpreted from cross-sections. I added the periscope sketches where possible, added a second crew hatch and rear loading hatch to make life easier for the crew.