Hi,
I know this thread is a bit old but I am building an ultimaker-like 3D-printer. To help buying all the parts, I have laser cutted some clear acrylic frames. You can find it on ebay (search ultimaker).
If you need other parts, I can cut it for you. I don't do business with my laser cutter but if it could help me to have fun with laser-cutter, 3D-printers, ...etc and help someone to build its own design for almost nothing it could be a very good thing !
Bye