The space I have for a FT could fit something around 5'x3' footprint. There's a local guy selling food-grade IBCs for $125 - I don't think I can build anything for less!! The problem, of course, would be getting it into the basement!! I remember Roger commenting about how he squeezed a cut-off one through the door; but, I don't need to cut it off for a grow-bed...
I have a friend that has a few cans of Zavlar that he'd sell to me for a great deal. Has anyone made a plywood tank coated with this stuff? I think I'd have to fibreglass the corners before painting the Zavlar on. I think using a pond liner would be a lot easier inside a plywood box, but it might add significant cost.

Ideally, I have at least 300 gallons of FT. I'd like to have all of the stands holding GBs fed from the FT eventually, getting rid of the smaller systems completely. Any other suggestions from you guys who've done basement projects?