I have a 3" lip around the top of the tank as it is Euro-braced. Here's an older picture.
A three-panel system is plausible. While I was mulling this over about a week ago, I thought about making acrylic I-beams, as they would be less prone to bend. Using 3/8" acrylic, I still think it will bow over the expanse of the tank, which is why it would actually be better to make it once piece as the fabric is light. However, moving the entire thing would be a hassle.
Maybe I should just convince my fish to stay in the water where they'll live longer.
