Use either twist tie wire or drill tip pan head screws and screw into the tubing at the bottom, but it looks like the tubing may be too thin to do this. Redwood is very available on the westcoast and holds up great in the wet winter. 12 inches is plenty high around the enclosure. An alternative is pressure treated 2x12 or cut 12" strips of 3/4 pressure treated plywood. This also wont rot after years in damp weather. If your worried about the iguanas touching the chemicles in the pressure treated wood, seal it with a primer on the inside edge. Sand is a poor substrate. It is too loose and soft, and the silica will keep bacteria trapped. It gets easily kicked into thier food, water, mouth, and eyes. I would rather see you use dirt than sand. A concrete slab is very permanent but the ease of maintanence is great.

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