Yes, I will shim the servo when I drill for the mounting screws. I use a small piece of 1/32 inch a/c plywood placed between the servo and the ply hatch for a spacer. I also use the same shim when I locate the servo mounting blocks - I place the shim between the servo and the mounting block (I do this on both ends). This gives enough space around the servo so that the case doesn't touch the mounting blocks or the plywood hatch.

Sometimes I drill and pin the mounting blocks and sometimes not - I haven't yet on this plane but I might.

We can only hope that Greg will wear them - I think the kids will enjoy the show!