To route the servo wires from the tail to the radio compartment. From the connector that plugs into the receiver very carefully remove the pins. Removeing the plastic connector from the extension cables will make it much easier to pass through the hole in the trailing edge ( especially after you already have one through there ). Run two strings from the radio compartment to the holes in the tail ( if you use light enough string you can use a vaccum cleaner to suck the strings through the tunnel). With the strings through the tunnel you're almost there. Tie the strings to the cables, now tape the strings to the cables so they won't snag on anything. Very slowly pull the strings from the radio compartment while feeding the cables into the holes at the rear of the fuse. Don't pull too hard if the cables snag on the hole in the trailing edge, be patient working the cable and string back and forth until the cable passes through the trailing edge. Once you have the cables through the tunnel replace the pins in the connector ( make very sure you get the pins back into the connector in the right order ).

You may want to practice removeing and replaceing the pins in the connectors on a throw away servo connector before trying this.