Well first off I think I'd reconsider your servo choice on the S3305's as they are classified as "surface" servos. The centering is really loose compared to an air servo and I have used them on an old Funtana when I didn't know any better. They do work on that application but jitter when the A123 battery is first turned on, here's the part of the servo description on Tower's website saying it's for boats and cars:

"FEATURES: Wide usage in cars and boats that require standard size,
high torque servos"

While it's a bit of a personal preference deal (some guys run nylon gears on the throttle servos), I'd ditch the S9001 servos as well since I do not run nylon gear servos on gassers.

Next, a 2600mah LiPo probably isn't going to handle the load once it's run through regulators which limit current flow and then there's the issue of matching up/operating all those servos through a single servo lead connector. Those will only handle about 3 amps continuous.

A PE would be in order unless you're running either JR or Spektrum in which case the big PowerSafe 12 channel rx's will do the job but I would NOT be using LiPo batteries with those rx's since they will take the voltage but the servos won't. In fact, I'd abandon the idea of using LiPo's for the flight pack on any radio system and go for either A123 (my preference) or the LiFE batteries and forget the regulators.