framing

Ok, so I've designed a tank, it's an "L" shape, 8 foot on one leg, by 6 foot on the other. I'm going to use 2x10's for a base, glue and screwed, 2x6 studs for the framing, 12" on center, 3/4 in ply, epoxy fiber glass coating, the hole shebang. My questions are what woyld be considered adequate...