I cut out the servo openings and servo lead pathways to the servos using the usual hot wire method. A 1/32” countersink in the foam around the servo opening provides space to glue in a 1/32” plywood frame. The plywood servo mount has been cut and drilled but not installed yet. Because I’ve made the large cutout for the servos so close to the retract mount I’m going to add some more dowels to the retract mounts for strength.