I've been reading around on here and a reef site researching a ton. I've built a plywood box and getting ready for the fiberglass stage. <a href="http://www.aquaticeco.com/subcategories/3048/Sweetwater-Epoxy-Paints-1-Gallon/sweetwater%20paint/0">Sweetwater </a> looks like the solution to the final sealing so it's safe for the fish. One thread mentioned 6 coats! I'm down for at least 4 considering I'll have rock and driftwood in mine. My concern now is getting a fiberglass that's pliable enough to shove in the corners and produce a good seal.
Another thread mentioned rounding out the corners (caulk or similar) to make it easier to roll on the glass. Really I'd like to see all the information come together into a nice "how to" in addition to all the "see my tank" threads.