I was wondering about that (the coolant reservoir). Does it really need to be at the high point? I looked it up and there's conflicting advice on the Kawi forums. I've seen several builds where guys strap a bottle to the frame, but it looks lower than the other rad hoses.
A good question that I don't really know the answer to, I've never done such a thing myself. It gets moved around a lot on track bikes though, you just need to get the attention of all the track folk on here