RE: Electric power question
Hawk,
Although each technique, series or parallel motors, has advantages, I would put the two Speed 400 motors in parallel and use a single ESC to control both at once.
Each motor can draw about 10amps so select a 25amp (or greater) controller.
There are many packs available that can deliver the 20amps you'll need for both motors. Depending upon the wingspan and wingarea of the plane (I am not familier with it) you can choose heavier packs that will prolong your flight duration. The compromise here is between flight duration and flying weight.
Typically, we start with a minimal 1AH (or 1000mAh) capacity per motor. Therefor, you can optionally use these cells:
[ul][*] CP1700SCR NiCd[*] 1800mAh HECELLs NiMH[*] 1950mAh 5/4FAUP NiMH[*] 1900SCR NiCd[*] CP2400SCR NiCd
[/ul]
Good luck!