I've been looking into different frames to start a project buildup and have decided on a 300ex based project. I'm just wondering what all kind of swaps have been done. I've searched and all I found was the 350x and a GSXR-600 swap. I've been thinking of maybe swaping in either a XR650 or CBR600F4i motor. Would it be possible to do either of these without stretching the frame? I would like to keep the stock frame geometry since I plan on doing some trailing. Some pics of swaps would be great too, so I could get some ideas. Thanks.