I am actually in the middle of building an R2D2 projector.
The waste basket won't work. I have one and it is way to small. A 7" screen is the largest that would work and then you would need a 180mm collimator fresnel and a 180mm collector fresnel and triplet.
Not very easy to make it work.
I am actually using a 10.6" Lcd and this :

It is a R2D2 cooler.
I will post a Plog when I am finished.