I've been a carpenter for the last 18+ years, and have made a ton of aquarium stands, though nothing larger than for a 180. The funny thing is; if you buy a tank from All-Glass, Oceanic, Perfecto, etc., they guarantee their tank only if placed on their own brand of stand, and they are pretty much garbage -yet pricey. Show me your plans, and I can give you some competent advice. If 1X1 inch is the strongest bracing structure, I gotta assume this is a small aquarium.
Nothing good happens fast in an ecosystem.