Hey Gene,
mate, I was fortunate in that I bought the plane with the wings tail and fuse sides already made and the rest of the tubing to nearly complete the plane. I bought it from Andy........ known on here as Escadrille. He would more than likely be able to steer you in the right direction as for what to use and where to get it. I've only had the plane for a few months and have been using the tubing that come with it. I think it origonally came from Performance Metals. But I'm sure someone on the forum woud be able to help out with likely suppliers. I guess that by the time I'm finished I will have had need to chase up some more myself as I think I will be short on tubing for the outboard wing struts.