Running, not running, all original, miles, what work does the seller know about, are you going to fix it up yourself or pay someone else, how bad do you want the project and so forth?? Parts for anything are around....sometimes you have wait a long time for them to show themselves, but they're available somewhere...even if you have to find a donor bike to get them. Your question is a lot like asking 'what does a kitchen remodel cost?' If it was me, and I wanted the bike, I'd start at half the ask if it's not running and claim 'as found' status and see where it goes.
