(Take care, you do not want the wiring from the battery to the ESC to be too long or you may blow the ESC!!
You should check threads about this here and on RC forums. ESC to motor length is usually not a problem but long battery to ESC leads can be. It would probably be better to mount the ESCs on the fuselage and have a short Y connection to the battery.)
Would there be any disadvantage to using two smaller batteries, one for each motor, mounted to the engine pods with the escs, with the esc leads linked to the timer mounted on the fuselage with y connector? Or would that lower the CG too much?