Check out Blue Moon, and Boxers by Bruce.
R75 make VERY nice cafe racers, especially with RennSport / Krauser kits
Once you get it running and safely rideable, it will take LOT to sell it on. Contrary to the idiots that have never owned one but have an OPINION about them, they are VERY capable in almost any setting including off-road as long as you protect the heads.
If you get one into good mechanical shape, and service it regularly, it will still be running strong when all the idiots that don't like them can't ride any more, and all thier bikes are dead rust heaps.