Here's my DIY stand, for a 75 gallon. Might help you.
I screwed and glued two 2x4's together for the 4 side posts, one side was cut short so the top would sit on the 2x4's. If the top is just screwed in, it will fail sooner of later. My only regret is that I made it too small. Not enough room side to side and I wanted the pipes to come down thru the stand, but not that can't happen. When making your stand, plan for years ahead, draining a tank to put it on a bigger stand is a big job/waste of time/money. Going for bigger sump, closed loop or Auto Top Off down the road might mean a bigger stand.