If I was to Protocase it, I would more than likely just prototype the first one for myself (at a cost of about $2000-$2500 I estimate), then I would offer to let others buy cases off of myself and use their purchases to subsidize my initial lay-out of cash. If too many people got in on the initial protocase buy, it would make subsidizing tough to manage (splitting everyone's money several ways). Of course, after the first one is made, the CAD drawings of each piece would be available, so the cases made after the original prototype would be much cheaper (though probably in the range of $500 since this would not be mass-produced). At that point I would take orders and make a bulk buy when I had, say, 10 or more to be built.

As of now, I have not gotten a response to my request for the sketchup, though.