I'm in, and I finally found the original resin I was excited about. A quart is $40, which should be about a kilo of material. I think that's about double the best prices for ABS from China.
I think this stuff, MakerSlide, would be a spectacular frame and motion platform, and it's cheap.https://www.inventables.com/technologies/makerslide
Here's a some resources for open source DLP 3D printing.http://3dlprint.blogspot.com/p/other-3d-printers.html
The King Daddy Yahoo, group for 3D printershttp://tech.groups.yahoo.com/group/diy_3d_printing_and_fabrication/
This is a UK vendor selling resin for, < $20, per Kg, that's cheaper than ABS, even with shipping I'd think.http://www.suscomp.com/resins.htm
and last but not least, you can make your own resin.
Check out the level of detail they get for the parts they make it's pretty crazy.
As you may have guessed, I'm all over helping with a group build. It's a 1 axis CNC, for which we have a stepper, a stepper driver, can use MakerSlide for the motion and whatever we want for the frame. That leaves getting some resin, a projector, and a Pyrex dish. I don't think it will be terribly expensive, I'd guess less that the cupcake, perhaps $400 to build the first working system.