Maybe the Moog crowd might also be interested in the LoopA DIY kit:
The LoopA is designed as a fun and straightforward MIDI sequencer device that turns jams into whole tracks. The software was optimised for live playing with “smart” functionality such as tempo-synched pattern changes and dynamic effects.
We are currently getting a metal case manufactured that should be available sometime next year.
Basic usage here:
http://www.youtube.com/watch?v=HOfW94UP2d8&feature=emb_logo
Build tutorial here:
http://www.youtube.com/watch?v=Np1JAQpdxFc&feature=emb_logo
Kits available now:
http://www.midiphy.com/en/shop/139/LoopA-v2-Essential-Kits
User manual:
http://www.midiphy.com/files/468/midiphy_LoopA_manual_v205.pdf
Have fun building!
Andy