Found some plans:

Looks like the rudder never had any linkages, and the motor seems to be a small nitro engine (possibly a Mills 1.75cc). I bet that was terrifying when it was running! Noise, smoke, fuel, oil everywhere. At least I can see where all the bits are supposed to go.

Also, this nice example of the finished kit. 

And another one.

And a detailed commentary of a scratch-built one. All going to be very useful...