The fellows around here used to throw .25 glow engines in those and fly combat with them. Power Way to much and a handfull like that. If you are a new flyer the the ideal engine would be a .15 glow such as the OS LA .15

Now if you want electric then you are on your own and sure to get suggestions here but the airplane is relitively heavy and flys with a fairly high wing loading as an early moulded foamy. I,ll leave those power suggestions to others.

Remember though make absolutely sure that whatever you do the airplane balances no further back that the Quarter Chord. Thats 25% of the distance between the wings leading and trailing edge back from the leading edge.

Any further than that and you will have a tiger by the tail.

Regards the empty fuselage wing compartment, welcome to an earlier era and an era in modeling when the fellows were expected to know how to do things such as balancing and installing servo trays or mount sticks. Basically you just epoxie two sticks accross the fuselage to screw two servos to or three if you are using modern mini servos (good idea). The third throttle servo could also be mounted forward to its own side mount or two short sticks epoxied to the side.

The aileron servo is mounted in to hole you dug out and two screw pads are epoxied to the center then short pushrods are made to connect to the aileron torsion rod horns in the middle. All pushrods are positioned to the closest possible hole to the middle at the servos and all pushrods are positioned at the controls furthest possible distance out on the horn.

John