Hey
Are you building the stand out of 2 by's as part of the wall itself?
Or a stand next to the wall and tied in with plywood?
I'm not sure what your planning but 2x4's and maybe 4x4 legs topped with plywood and foam can hold a lot of weight.
Do you need access for a sump under the tank? or beside it?
Maybe a sketch or pic of where it's going to go.
As for the lights how many bulbs are in the T-5?
Check out Melev's build thread on Reef Central it's huge but it's got a ton of info.
http://www.reefcentral.com/forums/sh...hreadid=406083