Shouldn't be too bad to be honest. DMC as a company may no longer exist as it did in 1980 but there's the group that bought up everything and the kitchen sink in Texas that still have shelf parts from the plant when it was shut down. Hell they have full frame/chassis available and from time to time build them with new old stock.
It all comes down to money. They could rebuild you the whole car themselves or you could ship them pieces and purchase parts that need to be replaced (interior too).
http://delorean.com/