[classicauto]

Do you have any welding experience?

If not - you'll create a bigger mess then you have trying it yourself. Although its not the worst place to start learning because a little warpage on the floor isn't the end of the world - you may want to pass on this one.

That rust is pretty extensive and going to need alot of surgery. There's probably the better part of $1000 worth of metal work under that car if you dropped it off as is and picked it up completed.