I'm starting to rethink my sump design as well. I like the idea of a sump sitting above the tank, but I'm running into problems with figuring out how I'll get this monster in/out of my house, since I only have regular 32" doors (the 6' french doors will not be where this tank is located anymore).
I'm now thinking of making the tank either:
6'x4'x2' = 359g
or
8'x4'x2' = 479g
The problem is that with an 18" tall sump-wet/dry on top of the tank, that makes it 42" tall, which is way too big to fit through a doorway. I may build the stand to be 30" tall, and then just custom build a plywood sump into the stand.
Does this sound better?
Also, for tanks that large, will a standard 2x4 stand be strong enough, or should it be made with 2x6's instead?