The servo extensions i got through quite easily as i first got a piece of string with a heavy washer attached, which dangled down and easily slotted through the hole, not sure why they blocked off the back half of the fuselage, ohh well i tied the extensions to the string and then pulled it through.

i got a chance to run the engine yesterday, it is quite a powerful motor for its size. im only running a paint stirrer prop (master airscrew). 10X6 at the moment on 15% fuel.
It got a fair bit of power but honestly i feel its going to not have the power for a rocket pullout of a hover, but i cant really tell untill i actually fly it. maybe i need an 11X4 prop, but at the moment im guessing 3/4 throttle for hover or just a little over. But as i said, im not building mine as an all out 3d plane like most people would want.