Just a note on spot welds. I hate them. I'm glad they're there, but getting them out is a pain in the you know what. UNLESS... you have a spot weld drill! Then it's only a major inconvenience.
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I bought a half dozen 1/4" spot weld drill bits and used my trusty Craftsman single-speed drill from the 1960's I bought from a friend of my wife's (along with lots of other awesome garage tools and toys... Thanks, Joe.) Here's a small sample of how many spot welds there are for just half of the floor pan. Just count the dots.