Pretty cool video. The good thing about wood is that the black sand and gold don't slide down the sluice so fast, like it does with an aluminum or steel sluice. Also, you don't need a long sluice box. If your not catching the gold within a foot or two, most of the gold is probably being blown out. I just put a piece of 1/4 thick plywood at the head of my old keene sluice. It works much better. Jimmygoat