Does the engine kick over freely? When was the last time that it ran? Based on the pics it seems like a good deal. The exhaust is over $300 new, and the tank, seat and sidecovers have some value. You can also sell off all or most of the 2nd bike to get your money back. BUT, if the engine is trashed you could be looking at a lot of money to rebuild.
A mechanically sound, but cosmetically poor bike makes for a less expensive cafe than vice versa.