I've wanted a post apoc armoured car for my 20mm project for a while, so remixed a few bits here.
There's a crewed turret using Karnageking's excellent gaslands crew, and also a correctly scaled techno turret if you want by Karnageking too.
I scale everything to match Dark Future minis, so somewhere between 1:72 and 1:64 - 21.5mm to the eye is my go to scale.
Test one on the printer at the moment.