Oh, lamp costs are between $20 and $35 for lamps that last 20,000 hours instead of $295 - $500 for lamps that last 1000 to 2000 hours. More expensive lamps can go for 4000 hours... but that still translates as only 2.5 years or so before you gotta buy a lamp (If you ignore the steady reduction in lumen output!)
Incidentally, the keystone controls on most projectors are digital... they make the changes in screen dimensions digitally. The Lumenlab design does it optically.
The ones I have been looking at use three separate monochrome LCD's and one panasonic unit has almost no screendoor effect. I am getting the feeling these homemade ones use full color lcd's designed for laptops and hand-held devices. Is that correct? And if so, is there not a resolution hit?