This time, a plywood and glass 150 gallon corner tank (48" sides, 67 7/8 front, 30" high). My brother has asked if I would help him build one. Has anyone built a plywood corner tank? If so, how did you do the top bracing? I have thought maybe an inverted triangle (center of front to center of sides, with a brace running from one side to the other. This could be a problem to light, however. Any ideas? Thanks!