Sr. Falcon EDF Power - Kit Bashing

[GuyOReilly]

Winter project identified.
I had 2 - 70 mm EDFs laying around.
With 2 kg of thrust each, that should be plenty for a 6-7 pounds airplane.
Bunch of stuff to figure out prior to starting the build.
That will be fun!!   
 

[GuyOReilly]

Quick calculation and the weight would be likely around 8 lbs. due to battery and 2 EDFs. 
QUESTIONS:
1- Should it be powered by 2 batteries or one?  The ESC are rated 70 AMPS and for 4-6 cells.
2- The nose wheel and steering is in the way of the planned battery tray. How about a tail wheel instead?
3- I need to test the engine/ESC/battery combination prior to mounting.  Any suggestions on test stand?
4- Wings are rubber bands mounted, how about changing to bolt-on for more rigidity?
Thank you.