A home improvement store or good hardware store should have most of what you need to start. The main body of the housing is PVC, which can also be found free of charge at many construction sites. The controls are from Ikelite, the latches are the same kind found on most camera housings and canister lights. All you need as far as tools go are a good hand saw, some sand paper, a drill, a few clamps and a roughter with a 1/4 inch square bit. Of course if you happen to have access to some power tools that will make things much easyer.
Scott