RE: need help configuring an airplane for electric flight.
I'm with Glacier on this. Hobby Lobby has motor/engine conversion charts also. Once you know what motors are recommended for your plane, you can use those specifications to seek out other motors.
I also hold the A123's suspect. There is a thread on the subject. I haven't read it as I have no intention of using them. The reason is that, like Glacier stated, is the lack of warning when the 123's run out of power. The thread may know of a remedy but like I said, I haven't read it. When the power is gone, so is control of your plane.
Good luck.
Lou