There are A number of ways to make up servo mounts, you just have to look at some of the ways othere guys do it on RCU then create your own system for each plane you build. On this wing I used epoxy and installed side rails on the two wing ribs then made up some flat ply to epoxy my servo mounts to then I use four screws to install the mounting plate, this way I can remove them when needed. I also make up round paper tubes that run through the ribs for the servo wires. You can see I have it ready to make the hatch covers so just the arms stick out, they are held on with four small screws. Each plane requires something A little different but this is one of the basic ways to do it.