Finally finished my tr-505, really glad how it turned out. It’s really a everlasting work in progress, but here are the bends so far:
-8 individual volume controls
-51 headerpins patchbay including synth sounds, sequencer glitches and drum rhytm glitches.
-6 patchable toggleswitches
-1 global pitchcontrol
-lcd spotlight and colourchanging led(not on the video)

I built it on a piece of perfboard painted black and only used pcb mounted parts to get as much bends in the least amount of space possible.
thanks to burnkit2600 for all the info on his website: http://www.burnkit2600.com/tr-505/