OK - I have made myself a beamer . Goal was "big and cheap" and at least Micky Mouse should be able to be projected live size. I have spent about 500 EUR in total for this project using a used 14.5" TFT, some lenses and light bulb. Not sure any more how much time I have spent building this, but it was fun.

Me in front of the projected movie - total range diagonal > 3.4M

Me on the Wii (..) and a beer ;-)

There are lots of manuals out there (try http://www.diyprojectorcompany.com to start with and only as reference) - I am not going into detail but this is how my beamer looks from the inside:

I need to remember myself making some pictures of the enire enclosing when it's working :-) and upload those