Holy crap, that Old Ben's House diorama is amazing! If I didn't know any better, I would have thought that it was a production still or something. What did you make those accessories (chairs, boxes, etc) out of? Is that all styrofoam too?
I like your 12" upgrades, especially the Tarkin head repaint. I was going to do a body switch with my Tarkin as well, but I didn't like hasbro's headsculpt, although after seeing your version, I might have to try it.