MLP to screen is 4 meters so a 10 foot wide screen is around the 42 deg recommended field of view, any wider would be uncomfortable
I experimented with a 10 foot wide scope screen mock-up but I didn't like having to keep changing projector memories
10 feet wide 16.9 works fine for me even with black bars top and bottom
Looking through some threads a lot of members went for 2.40:1 then eventually went back to 16.9
ah ok, yes always best to experiment. I am 3m away from a 10ft wide scope and find it to be perfec. Think I would go for a 4m wide scope if I was in your position though, but it is as always personal preference.
My preference is CIH, unmasked grey bars on left and right of 16:9 don’t bother me but grey bars top and bottom would. Zooming in and out with my JVC presets is super easy.