Yep, I used 2 x 8's for the main pieces and corner angle braces, and some 2 x 4's for some additional cross member strength. I then put a piece of plywood across the top. There was enough padding and carpet to cover it after the basement was done. It is very heavy. It is exactly 4' x 8' in size, so the plywood fit perfect on top...
I did find out that I had to raise my screen up about 6" so the people's heads in the front row didn't interfere with the back row viewers.
Here is a great calculator to figure out your riser height...
http://www.cinegi.com/cgi-bin/riser.cgi
