1- Mount ESC and engines as it showes in the picture. Fix ESC in position by help of cable belt and velcro strips.
2- Instruction regarding how to do the cable harness between battery and ESCs can be found in following link:
https://sites.google.com/site/arduinomega2560projects/quadcopter/step-by-step-build/soldering
3- KK2 board will be mounted on fibreglass plate by four plastic screws. put shock obsorbance between kk2 board and fibreglass.
4- RC reciver can be mounted on velcro belts which has been used to tight the battery.