I´m using a flat screen 2,4m wide. Later I will try a curved screen.
The projector is choosed regarding the wide angel property of the lens system. I found out, that the Panasonic PT AE900 is a good model for my sim.
In a distance of 3m this beamer gives a width of 2,25m. The beamer is a 16:9 model with HD ready.
The keystone correction is important as well.


View out of an Airbus A319, A320, A321

Simulator projection

Picture story

The position of the beamer under the ceiling. 
From the front. This position is limited by the height of the ceiling. 3m distance gives a width of 2,25m. 
  The side views are planned with simple 17" CRT´s.