I'll just be mangling a two year old Antec case. Nothing special. I should post some pics of my monstrous A1200 setup. Everything's spread out on my drafting table. Since cooling isn't a problem (no PPC), I really think I should just mount this on acrylic, too. But there's that pesky dust to deal with. . . .
The C-One is too big to fit in a breadbox, but it might fit in a C64c (don't have mine handy to check). I'm sure Jeri (or someone else) has posted something somewhere about interfacing with a real C64 keyboard.
It should be possible to gut an SX-64, put together a keyboard adapter, replace the CRT with a VGA LCD panel, and interface directly with the built-in floppy drive. You could also rig connections to the external connectors--serial, joystick, cartridge, etc. Definitely a cool project for someone into hardware hacking.
Trev