Welding body seams

Been down the warpage road with another car I did, so I'm extra careful. I like the spot weld idea. Don't know if I want to spend the bucks right now. I would have to justify it with another project. Don't think my wife would appreciate my logic either. (I've got one side welded in, and it came out pretty flat. My next side should be better, as I will change a few things that I did).
Howard.

Added a pic of the welded in panel.