I looks somewhat solid, not sure about those #'s he claims either, needs full rustoration, a bunch of the hardest parts to find aren't even there, glass is junk, most the stuff around the windows, is bad, but the main body doesn't look all too bad, I've seen far worse, but $12k seems high, for what's left, IMO your buying a Vin # basically... But I'm not in the market either, many others I'd rather have & I've had a few of the 62-63 413ci S/S MW engines too, parts are getting extremely rare & very expensive, for what they are, some people think rusty old parts & cars, is worth it's weight gold today... Seems like you can spend a total of $80k+ in restoration costs {especially if a body shop does most the work} & all the really hard to find factory parts shipping & time finding all the missing parts, you'll have a nice car worth probably $75k car... I hope I didn't offend you, just being brutally honest... Good luck
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I see your from Aussie land & it may be worth much more there, than here...