First tank I had was a 75g with factory stand. It was made just from HDF (laminated) with cutouts which door were placed over, so there can be strength without a frame.
To do a framed stand is simple also. I put my 75g sump on a 4' stand made from 2x4. I did 2 2x4 in each corner, glued and screwed together in a V shape which was probably overkill. Each corner has leveling feet. I left mine open but could easily finish by attaching plywood panels.
