Here's the plan for a poly-duo-phonic; it's all DIY from full kits (ordered). I've also ordered the frequency central power from synthcube. I'm going to build the box too. I already own a makenoise 0-coast, a bastl kastle and an arturia keystep. Hope they play well together. (for some reason the cat didn't like my layout so she modified it to what's below, that's ok, I like cats)
ModularGrid Rack


Not too shabby! Now drop a 2 hp mult into that hole you've got left ('coz you need one!) and bust out the soldering iron!