Working on 3D models of 1:100 vehicles

I am working on several 15mm weird tanks from Early XX century such as Mendeleev Tank, K-Wagen, Fiat 2000. I also have plans for Interwar vehicles such as M2, Leichttraktor, Vickers Medium MK III. I really want these models to be produced, so I am making them suitable for 3D printing.

Here are early drafts of Little Willie Tank with and without outlines.

And Top and Left view from 3DsMax: