OK, so as Philetaylor, this one is not a real MIDIBOXed device (so far).
The only DIY part are the wood panel.
But the MIDIBOX I think I would like to build would probably integrate some features to control ASB invisible features (knobs for FX control and realtime control through pitch bend, modwheel, velocity and aftertouch).
So the chalenge for me is first to imagine a way to provide access to multiple external synth including ASBs, ASX/Plugiator, NOAH Ex, Chameleon, and maybe a few Waldorf gear. I must admit it is a rather ambitious project but that's mine.
The second step would be to build it up !!!