I have a complete G15 and a G80 frame, it looks like the engine mounts at the front are a little different but could easily be modified to fit, the rear section may be a little different in details like passenger footpeg and exhaust silencer mounts. Unfortunately the G15 is in the US and myself and the g80 frame are in Hong Kong, so I can't easily compare. I was going to turn the G80 frame into a G15 type replica using a Commando engine. I will try to find my spare rear engine plates and try a set of cases in the frame when I get time.