I have the gecko that was put together allready I used a GWS Micro servo on the right side of the boat. and the stuffing tube sticks out about 1 inch as far as your Batts should work fine but you just have to try and see, I am useing A E-Flight speed 400 Brushless motor and 3 cell Lipoly batts and it is a rocket hope this helped any more questions just email me at [email protected]