Ok, I just took a look at mine (and actually started working on it!!!). There is a small bulkhead at the bottom of the fuselage, about 16.75 inches back from the firewall, and 20 inches back from the center of the side exhaust port on my engine (Evolution 45GX). That short bulkhead holds the front of the servo tray for the rudder servo. I don't see any reason you could not run the pipe over top of this, and move the servo somewhere else. This kit allows the rudder servo to be mounted in the tail, but that is usually because of balance issues when using a heavier gas engine.