I've already done 2 ktm to ktm 4t hybrids: http://www.advrider.com/forums/showthread.php?t=662808
I got a good deal on a Craigs list CR5 and already had a 08 ktm roller in the garage. From the 2 other ktm hybrid builds I've seen it should almost be a bolt together build. The Honda parts will worked over as well, I just want to get the chassis done first.
pivot spacers and getting the sprocket into the correct horizontal alignment.
The right rad outlet points in the wrong direction (for a 450sxf radiator)
The right outlet is perfect
The shock spring to pipe clearance may need some tweaking
Old mounts cut out and cleaned up
Re-positioned for the 500 engine and welded back in