So I've had the chance to break in the trike a bit and here is my first impression.
Handling- The KMX with hookworm tires has extremely fast and precise handling , ok i'd even go so far as to say twitchy. I may put a steering damper on it . I did that to my last trike and it helped a lot . By using the Staton axle mount kit the center of gravity is low and the trike oversteers without any tendency to roll. It is light though and you wouldn't have to slide into much of a ripple to high side it.
Propulsion - I really like the Staton axle mount chain drive system. The mount is low and very rigid . It will take all the horse power I dare to mount to it. I've started with a tanaka pf-4000. I have a 47r in storage somewhere in a another state but this will do for now. I did order the 15mm carb and a stalker free flowing muffler for it. I really like the tanaka, the bottom end is really well built. I need to work out a pipe that fits this bike , mount combination.
I really wish that I could figure out a way to drive a nuvinci hub through the transmission from the left side. That would let me build a peaky engine and get it to the ground.