A control line stunter

Auto spray should be fuel proof as long as you don't leave raw fuel on for too long. You could always mix some Epoxy, thin it a little and wipe it around the engine bay.

I don't see an elevator in those photo's  or is it he camera angle?
Are you leaving the fin/rudder chopped off square, like that?
How did you manage to set fire to it - soldering on the clevises with a blowlamp? 

OOH RCS (Radio Control Specialists) from Hounslow, Middlesex. I had one of their six channel propo sets, 27 Mhz of course, with a monster 1/4 wave telescopic aerial. Ran on a big square 9volt battery, and proved to have a useful range of about 25 feet! The receiver had a four-cell nicad - with FIVE wire servos. The nicad was used as two pairs of cells, two cells positive, 0 volts in the middle, and two cells negative, so the servos were painfully slow and feeble, by modern standards!

For those that don't know, those transmitters with switches all over, that play tunes, are REED system. As described, each switch applies a different tone to different reeds, which vibrate, and 'make' a connection in the model - thus moving a servo that was sprung to return to centre. Who remembers the 'Mighty Midget'? For fine control (no sliding trimmers!) the switches would be pulsed on/off by the fingers
The fun began when the engine was started - as the vibration of the engine could cause the reeds to chatter - and drive the servos!
Plus  the receivers were pretty crude and not at all selective (pre-crystal control - note only one model operated at a time!) and if somene turned on a mains light switch, used a hair dryer, a vacuum, or a drill, the receiver would try to react to it!