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I'm wondering how you could adjust the lens to overcome the parallax error
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Keystone correction? The lens after the LCD has to be parrallel to the projection surface. Mount it on a pivot, etc
Gravity can make it adjust automatically if it pivots freely and has some weight at the bottom.
Alternatively, have a look at this guys PJ - it has a nice fine tuning keystone adjustment:
http://www.lumenlab.com/forums/index...pic=2394&st=20
Regarding the spherical mirrors its interesting that the french diy trend is to use a fairly small reflector, such as this one
http://www.izzotek.com/reflecteur.htm
Maybe this is just because they also use small bulbs (typically 250w MH)...dunno.