I have a box very similar to this except the lights in mine are on opposite ends of the box. Is there a reason why some boxes have their lights facing through the front of the box?
This is actually closer to what I use except I'm using some funky light stands that don't have a "bowl".
I'd like to build the same light box that I already have, just bigger, and maybe better? As Falcon16 had suggested I may try using plywood or something to give the box more support. As it is now at 30in across it is starting to sag a little.