RE: Sig Kougar Build
Dan, The spacers are made of nylon and can be purchased at the hardware store. They come in lengths of 1/4, 1/2,3/4 and 1" . I doubled them up to get the 2" needed.
As for the Axi, well I don't think it will have enough power at safe operating levels, but I'm going to try it anyway. I am considering a Hyperion 4020/10 outrunner which has a high enough KV and yet able to produce more than enough power. I might even consider a NeuMotor LOL for rediculous power.
If you can get a goodmotor to fit, even with a gearbox, such as a HackerB50 or a Mega with a planetary would also do the trick. Inrunners are more efficient, although the Hyperions and even some of the new Hacker outrunners are pretty good as well.
A 5S Lipo seems to be the right size for this type and size of plane. Just make sure there is plenty of ventilation for motor/ESC and battery cooling.
cheerio jollyroger