Since the building part of the contest is now over, I'll be posting more updates here.
So, I couldn't sit still, and started with the much-requested 3-barreled minigun:


Once finished, I'll try and mold it, but since the barrel assembly is a bit fiddly, I doubt that there will be more than a few castings. We'll see.
Edit: Oops, wrong board. Can anyone please move this up to workbench, please?