Cool bus, but you aren't going to be able to 'just go to the store' to get parts. Finding parts will be an Easter Egg hunt at best & a search for the Holy Grail at worst. Will not be cheap or easy - - - But will definitely be an adventure ! Know this sad fact -- that bus will be very expensive - even if they pay you to take it. !!!
Also-what engine does it have? I see easy spending $150,000 on this conversion. Good Luck, TomC