Definitely in need of some TLC - but the bones look like they are there.... http://auctions.cheffins.co.uk/asp/fullCatalogue.asp?salelot=F090316++217+&refno=++145384&saletype=
Yep - buy only if you need a case / bracelet / movement / caseback (and you don't mind it in bad condition), and only if it's cheap (> US$ 2000). Considering the -71 had a stepped dial, and what those are going for nowadays, it's not worth trying to build one from this.