I don't see any red flags. I would, however, ask the seller for a close up of the plated surfaces and a close up shot of the inside of the bottom bracket housing. Ask also for some pictures of the frame when it was "way ugly".

Other than that, I can't think of much else to set your mind at ease. Perhaps wait for just the right unpainted one to come along.

Not sure, but I think one of the forum members has a drop dead gorgeous Basso, with chrome lugs and all, for sale. Perhaps he, or she, will chime in.