It's been done A LOT. Most plywood builds incorporate metal bracing if they are large. Anything under 200-300 gallons is likely a waste of a plywood build though. You can easily use a steel frame with plywood sides, bottom, back and a glass viewing panel. Many, MANY, plywood tanks use steel rods as braces front to back. The reason you fiberglass corners is for a smooth, water tight, seal. Plywood to plywood in the corners could easily allow water to pass between and ruin the tank.
If you are going to go with glass on all sides with a steel frame, you're likely better off buying it.
This site is terrible for plywood builds, but monster fish keepers is great. Very few planted tanks exceed 100 gallons. Even less get into the realm of feasible plywood builds, cost wise. You need a tank that is several hundred gallons to make a plywood tank 'worth it'.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.