Just been reading back some...and I realize (now) that the current case as it is, would not be able to house the RasPi board. I'm holding up my Pi (rev B board) next to my 1GHz Pandora, and the base is about the same height. The existing battery and a new PCB/keymat makes it too tight of a fit...but that's fine. The bottom case would need to be remolded anyway to make the ideal RasPi case (IMO). It needs to be deeper, and if you're going to design/remold the bottom portion of the case, you might as well adjust the necessary slots/holes that would line up better to match the PI's ports. Plus, making it with a hinge or some sort of clasp that allows the case to be easily opened would be great.
Most of this is just me being me - just thinking out loud. I'm not an innovator, and I'm more than sure that people have already mulled this/these ideas over before. If sales do dry up though (for the Pandora), and the OP Team is still in need of future sales (of something) to fund the P1 preorders and payback the investors, then I think that this could make money. There is a HUGE market for this type of product (IMO). If the OP Team (or member) wanted to undertake this, I'm positive that you'd have a lot of backers...possibly in the tens of thousands.
What you already have going for you is a pretty good case. I was a bit apprehensive about buying my Pandora because I was reading lots of posts about the brittle cases, pieces not fitting right, newer screens not looking as good, etc... I've been pleasantly surprised. I think that the build quality is actually quite good. Anyway, it's interesting to think about...