The previous owner of El Gordo (my brother) now has two functioning legs again and wants to get rid of his ... hmm .... how to put this ..... completly

So he's been talking with a bloke who has one. Few things wrong with it in that it needs some new doors or the currents ones patching and sorting, new ignition barrel (stone me their expensive) and final (the biggest thing) "filler on the scuttle".
I know little of body but the scuttle is a rather important panel. Sorta hold the car together to a degree and he (my brother) says that it "needs a little filler"
At what point of scuttle rust is too far. I'm hoping the bloke my brother is getting this mini off is talking about a different panel. But if there holes in the scuttle should he just leave it and walk away from it?
Cheers for any info.
Peace.