Had a chance to build another screen wall for a client so I'm going to copy some of the details of the construction into this thread. This is for a 120 inch wide DIY 2.35:1 screen.
I like to use the 5/4 finger joined exterior trim boards that HD sells in 16 ft lengths. They are knot free and importantly are straight and stay straight. Of course they are significantly more expensive than studs.
Here is the supply for the screen wall, screen frame and fabric panels, I get them cut to rough lengths at HD so that I can fit them in my SUV.
Here are the parts for the uprights, two 5/4 x 3 1/2 x height plus some scraps for the base and top.
I used butt joints and here I'm setting up to screw them together.
added the bases
My two twin towers
Picture of the cross piece
One screen wall to go, stopping off for a quick beer:
installed at Jesto's
We used a laser level on a ladder to give us a reference line for the cross piece and added blocking that the cross piece rests on. As I look at this picture I wonder why I made the blocking so long, I think I will cut them down to a length even with the bottom of the cross piece if Jesto lets me.
Added 3 - 18 inch Zbar brackets.
The whole structure will get painted black and hidden behind the screen and black fabric panels. The structure is screwed together and screwed in place. If in the future Jesto wants a different size screen it can be recycled by just modifying the cross piece. The width is calculated so that the edge of the screen falls half way on the uprights. The fabric panels will park on the other half.
Update, I did swap out the blocking