15mm Monowheel Tank w/ Interchangable Bits (1:100)

Model of a public-domain article from 80 years ago: prints in several parts for ease of assembly. Note particularly that the guns (and hubs) use the standard 64thou cylinders - they can be swapped out for any Lego accessory, if you really want to make a lightsaber tank...

Dimensioned out entirely in FreeCAD, then repaired (and plated) in Slic3r