Cool !
I know alot of the 'purists' rather despised the oil-in-frame model chassis but it really is a much stiffer and better handling frame for putting Ninja parts onto it !
I don't know if it is true, but I had heard that the OIF was built for the BSAs, and then Triumph ended up taking the frame from them to put on the Bonneville.
Getting the taller Bonnie engine to fit was a bit of a squeak.