Excellent, I really liked the Minimig design you made for its simplicity, functionality and elegance. I'm still planning on putting my FPGA Arcade into a keyboard, but considering the size of board, a case like yours might be the more practical option.
I'm thinking that gutting a broken A1200 would be really appealing, if hooking up the keyboard isn't too hard, and sorting out the connectors wouldn't look too ugly.. I always did want an A1200 (my upgrade from my A500 and A2000 ended up being an A3000 instead, and that was my last classic)