Plug Weld Floor Pans?

Originally my plan was to have a shop do the body work on my Duster, but it's pretty costly. I'm not exactly the best when it comes to body work, but the floors are so rusted I'm just removing and replacing anyway - so I don't have to fuss around making patches. I only have gas (oxy-acetylene) and stick welding equipment and experience. Is it advisable or even possible to use either of those techniques to do the plug welds in the floor pans? Do you know if it'll penetrate enough and make a solid joint - or would I have to use a MIG welder to securely and cleanly attach the new floors? Will it be difficult, and has anyone used either of these for a similar job? Thanks.
We just replaced front passenger pan on mine. It was no big deal. We used a mig. We cut the old pan out. Used it for a template to drill holes. Cleaned everything up and and welded it in