Here's the freshly (and crudely) welded and painted stand that will house my sump on the bottom, frag tank in the middle, and the water change tank up top. Trust me when I say this... you don't need to see the welds! I just tought myself today!! hahaha.
What I did is took an old 90g stand, cut it to 40"W, rewelded it, then added the square tubing frame up top for the water change tank. All three levels will have a plywood base.
Now onto the plumbing! Ugh.