RE: aluminum airboats
At the moment I have a Miller 225 Bobcat, Lincon 250 Ranger, Lincon 135 mig welder, Miller 211 mig welder and a miller 100 series spool gun. I make my living welding, been doing it for a while. I have just been building the rc boats with the burch plywood, makes repairs easer on the customer and IMO the wood hulls handle better than the aluminum. Downfall with the wood, I only use top grade 5ply+ and it is very costly, and build time is much longer.
The last aluminum airboats I have built, I went with the .063" on these hulls I may use .070" still debating on that.