I'm another guaranteed customer for one of these. I'd definitely prefer pre-assembled and 12x12 (as small as possible is best), but can handle the kit form and larger format if that's what ends up being available.
I'd also be very happy to buy a custom case, if one is made. Otherwise I'll make my own.
I'm not sure if these have a serial port on them, but if they do then I'd HAVE to get two, just for 4 player Lotus II! :-D
Edit: Checked Dennis's Minimig site, it does appear to have a serial port YAY!