I got the inner door section welded in......
metal fitted and tacked into place.
a boat load of tack welds until you have one solid weld.
I do this to keep from warping the thin sheet metal.
after the welding is done the welds are ground down.
First with a hard disk.Then it is ground with a soft pad.
a "skim" coat of fill er will be used to smooth the surface out nice.......