Cars II, for now I'm using a long 5mm ball end allen wrench. It's tedious inserting the wrench inside the wheels opening. My hand is not that big, but take me few minutes to catch the screws and titght them on. The better is to make an opening on the bottom of the fuse near the wing root when the bolt is. Look where is the screw and the ball link. That is the spot where to open the little channel. I still need to do it.

My battery packs are on the center of the pockets that the plane has. Look the pics. I made a access hatch for the batt. I am using tow 40000ma duralites one for ECU and one for RX. To secure the batterie hatch I install a blind nut in the underside of the turbine mounting block.

About flight time I am flying 7min about half throtle and still have more less half tank. If throtle is handle carefully you may get to the 10min flight. Hope this answer you questions.

BRGS,
Alejandro