Ducati do make steel swingarms, on the Monster and the Paso, which is longer than the Monster swingarms. There is also the Cagiva Elefant. Mate built this one below! 50mm Magnum forks, 100mm extended Monster swingarm, Custom Ohlins rear shock. http://www.advrider.com/forums/showthread.php?t=428685
Lots of great
advice above!!!! However I would say, build what you want, and half the fun is overcoming the challenges. That is what this section of the Forum is about. Once you start to build a bike you will realise there will be plenty
DrJoe's build thread has taken many changes and ebbs, he has learnt a lot on the way through. So have those who have read it. Started Feb 4th 2009 and still going. http://www.advrider.com/forums/showthread.php?t=429917
If it works or not and time is of no constraint have a play
You will learn so much in the process. Im sure John Britten would have received some criticism on his builds too
Saliah is correct that it is much easier matching the engine and frame, dont know why you want the Ulysses Frame, if you like the styling, why not graft the tank and other body parts onto a suitable frame to start with.