last night me and rotordemon were talking and it seems like it would be possible to either build the projector vertically and use a mirror to aim it at the screen. this would cause problems with a reversed image, but that could be fixed by rotating the lcd. you would also have a problem with heat rising. the second would be to build it normally place it parallel with your back wall and use a mirror to put it on your wall. either way you save space. the mirror could also be inside or outside your design. also i'm new here and haven't built a projector yet. i did the panel and ohp thing. but that was no good. this should be better. let's see if we can get passed this.

http://www.lumenlab.com/forums/index.php?showtopic=860

Welcome, newbie.

Yep. Several people have used mirrors here. My final configuration will use a mirror to project out the side of the box. I think a few people have used regular glass mirrors for this, but getting an optical quality front surface mirror might be worth your time.

I don't know that I would be able to tell the difference, but I found good front surface mirrors on Ebay from a guy who was parting out an Xray machine.

I know EdmundOptics has front surface mirrors also, but a little pricey.

Good luck with your design.

Thanks,
Zendance

Hey hey.. welcome to the addiction

The idea that crossed my mind after talking put a mirror inside before the triplet at a 45 degree angle, instead of placing it after the box. that way the box would have a footprint of approx 16 inches.