Rather than using glue for the cf peices use double sided tape or velcro, this way it will be less permanent.
The CAT was designed around the Core RC lipo so it is the best fitting lipo on the market. Having said that the later cores have the wires on the oposite side so you can have them at the rear outside of the car.
If you have one of the origional cores then yes its tight but as David said you could stick the balance wire down or fix a wire clamp to tuck it away safely for each run
