No problem at all. In fact most AFRs do it that way now.

The easiest way to do it is to sheet an area between two ribs (Instead of using cap strips) Cut out a hole for the hatch, but make the hatch itself out of 3/23" ply. Then add a plywood strip to each side of the hole (On the inside) to screw the hatch to.

Epoxy two hardwood blocks to the hatch to mount the servo to and cut a slot in the hatch for the servo arm

make sure you cut the slot large enough so the arm AND the clevis can move freely.