....I wouldn't be scared of the mileage, if the motor runs quiet when it first starts from cold, and makes good power, it is probably going to be OK. I friend of mine bought a '71 a few months ago, a stocker candy brown one with original paint, with well over 50,000 on the clock. It runs fine, uses no oil, and makes good power. However, a concern could be on your particular find could be the lack of original parts? Cafe bikes are cool, but not everyone's cup of tea, (old chap)
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Unless they are really well built and tasteful IMHO, they are not worth as much a a stocker, and could be harder to resell, too. My guess is he won't be able to sell it for 2K. Keep his number and call him in 6 months, after the riding season, see what he says. That will give you time to look around and test the waters. P.S. oops..... sorry just saw you wanted an expert opinion......yikes
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( I have stayed in Holiday Inns lots)