Quick update to say my Yamaha Apex / Skytrax Gearbox / E-Prop Durandal powered Cruzer is flying and performing above expectations (which were high to begin with !).  Performance has been truly outstanding.  Added benefit has been the small radiator / heat exchanger and fan I installed behind the panel.  It being fall and getting cold here in Canada it sure is nice to be able to continue to fly with the colder weather and still be nice and warm inside the aircraft.  The liquid cooled Yamaha engine set up made this possible and I like it a lot!