Your floor will be easier since you have chosen to use heavier material to work with. It will take more heat without causing you grief. You'll do just fine.
Well still no floor, didn't get much time on it this weekend as I wanted too. Alot of making sure things were squared up and in place before all the final welds. Will keep you posted.
I know the feeling. I bought enough sheet metal for everything that needs attention on the wagon, and haven't sat down and cut one piece as of yet. Figured I would have had the rust all repaired by spring, no dice. At least I did get all the suspension stuff ordered, and awaiting time for installation.