Hi Lookielook, first the tanks supplied are plenty big enough,i linked them both together and feed retrack,s,doors and brakes from both,for the elevon,s look at FEJ web site instuction manual F16 there are clear pic,s of how the servo,s are installed,just screw base plate in so that you can remove if required,do not remove excess fibre glass the aileron sits inside this to stop flutter,recess the pin hinge into aileron so that the pin is 5mm from leading edge of aileron then glue but check for proper rotation of aileron first regards Keith