I have used two methods for creating the windows for the aileron pushrods to pass through the plated ribs.
The first is to create a box with cap strip material after the rib was plated on ONE side. Then add the plate on the other side and once dry rout the hole with a piloted router bit.
The other method is to glue a spruce block in location between the plates and then use a hole saw to make the window.
This was done to prevent having to internally varnish the plated ribs.
