I finally got to make the new servo installation in my Slo-mo-tion IV. I made it in a way so it is rather easy to remove the servo if needed. I guess this is based on experience. I have learned that these kind of things should be accessible and replaceable for easy maintenance.
Here are some pictures of the servo installation:
I also noticed that the new propeller will be further back and may interfere with the rudder. For this reason I ordered a new rudder. The new rudder has water pick-up for cooling. At first I won't be using that. If it proves that the current pick-up won't work, I'll look into using the water pick-up in the rudder instead.
To make a better weight distribution I have decided that the ESC will be placed in front of the motor. I haven't started looking into that yet, but I know I'll need to remove the motor to get the ESC in that position.