Complicating things when doing a complete spray job on a TR6, mine has an undercoat under all fender wells (wing wells doesn't sound right) that is virtually impossible to remove. Got enough out to see that there was no air or moisture, hence no rust, so I just sprayed right over (or actually overlapped with paint) then just touched up the undercoat. All the above points - solder, brase, weld - point to the fact that reassembling a TR6 and expecting a gorgeous paint job afterwards is not gonna happen. Point made to get your spray man to overspray or final coat the whole car intact. A good tape man can do this as good as factory. Knowing that your roadster is rust-free, well primed (very important) and professionally sprayed lets you sleep at night. Putting the engine, wiring, interior, etc. back then becomes a labour of love. It must be the Christmas season, I'm getting all teary eyed and sentimental. I think I need a new project car. But might need a new wife.
Bill