It will frustrate you more than anything. You could probably use it for what you are talking about if you use a lap joint on the floor pans. I have one just like it that I purchased from a local salvage place for 90% off. I paid under $20. I have relegated it to welding heaver than sheet metal. I put some nice holes in some practice runs with it. If you can swing it you will be a lot happier with a gas shielded welder. A good one that is adjusted correctly is almost like running a bead of caulk.
