Here's what I came up with using google sketchup for design ideas:
Basically it just shows the 75gal which will be used as a sump shoved into the bottom part of the stand to make sure it will fit. I am still in the dev stage, figuring out materials needed, sizing, etc.
I may be increasing bracing as well, I'm not sure if this setup with 2x4s will be sturdy enough. I may also switch to 2x6s or 8s for the vertical pieces. Other considerations will be disassembly because I don't plan on living where I am now for very much longer (anyone selling a house? lol). It has to be pretty high because of my damn giant skimmer, ha ha.
I would appreciate any ideas or input. The main tank will be a 90gal FOWLR.