So, Paulson Games is making a mecha game called Mecha Front. Unlike umpteen other companies he's not doing a kickstarter, at least not yet. It's in the 15mm range, and he's got one mecha, the Nor-Am Raptor up for sale as a test bed. I picked it up, and here's the finished result.
The torso is magnetized so it can twist, and the arm weapons are as well, so that they can be swapped for alternate variants.