An inexpensive (<$125) combination Zorro / PCI busboard for A1200 towers would be awesome. If it gets more expensive than a PC motherboard, then there's not much of a return on investment for the hobbyist user.
I'd also like to see a new A1200 tower design. Something prettier than a Power Tower, sturdier than a Micronik, and much, much, much smaller than a Mirage. The A1200 motherboard is a bit on the long side, but it should be possible. Hmmm. Something along the lines of a Power Mac G5 chassis would be cool.
A nice rackmount chassis for the A1200 would be cool as well--but this would be a pretty small market. And I guess it really wouldn't be too hard to modify an ATX chassis; however, ATX boxes are usually pretty deep, and it would be cool to have something that fits nicely in a 19" wide by 17" deep A/V rack.
Trev