Yea thats about the best you can do for now. A salvaged bike would be ideal. However, they ain't as easy to come around, as say a Honda, I'd recon. You'll have to look hard. A used engine is possible though.
Since you ain't in no hurry, it'll probably come sooner or later. Or if you or you know someone than can fabricate an engine to fit it that'd be good. But then again, with that much work its not worth it.
85 Honda Shadow 700, 86 Honda Elite 150 deluxe, 2001 Honda Elite 80, 07 CRF 100, 07 CRF 50, 07 DRZ 250, 78 CB 400 Automatic [Project Bike]