Chad Steimel kindly supplied 3D CAD drawings, and had the following comments to make: I used the drawing on the website of the 3 cm Minengeschoss 108 Ausführung A mit Zerleger (3 cm M-Gesch. 108 Ausf.A m. Zerl.) and reversed it from there to produce a fully detailed 3D CAD model in ProEngineer. It's a lot of work to produce a model from a non-dimensioned drawing, probably upwards of 40 hours including everything. There are a couple of things I'm not sure I got right: (1) being the safety coil, and (2) being the cartridge primer, as I'm pretty sure it was electrically primed?