[bpape]

I assume the question was is there a problem with the length being less than the width. Ideally, you want the longest dimension of the room to be your length. That said, there are always exceptions based on the situation, symmetry in the front, etc.

Also, you should really identify seating position first, regardless of the screen and then get a screen of appropriate size based on that distance. Forcing seating position based on screen size will lead to poor results in terms of acoustics and surround field.

Bryan