Excuse the mess (one of the main chambers has a bunch of moving boxes in it), but you can see how I fiberglassed over the plywood shell. This is one of the 46 gallon sections at 2'x3'x20". You can see my rudimentary plumbing out of pvc in the basin which I can adjust/add/delete to fit with whatever will be decided overall. You can also see the small 10 gallon section thats called a "detritus trap" in the aquarium hobby. The point of this trap is to create a chamber of slow low flow that funnels dropping waste to a drain at the bottom. Perhaps this could be of service with a hydro set up? Anyway, the gray glue on the walls in the pic is me using epoxy glue to seal spots where the fiberglass split when I ran a grinding bit to smooth the corners where the fiberglass overhung. It is still under construction and will I will go over it with one solid white coat of resin when I'm done. Hope this pic helps anyone understand better what I have so far.