RE: Jumping Jack Set Up for 3D
That power system sounds fine. I think everyone leans towards the gearbox motors because of the convienance of a gearbox motor already beeing compatible with a Stick-mount firewall. Lots of company's sell Outrunner Stick mounts, however.
I think the Axi would work very well. I have flown the JJ on many different setup's including a Razor 300, and its a pretty versatile airplane.
The airplane flies very well, and You will enjoy it.
Josh