Well, I use the BEC that is in the ESC. I am running 4 servos, and when I have it in glider tug setup it is 5 servos and have not had an issue so far.
I just used stand offs, threaded rod, blind nuts and nylok nuts to mount my motor. I used "PEX" tubing from Lowes. It is something like 5 feet long and is about $5.00
Here is a video of the plane in action.
http://www.youtube.com/watch?v=V5k-h-n5IVA
Buzz.