The plans are in MAN. Been A lot of talk about the heavy prop nuts over the years but to date nothing ever settled to keep anyone from using them. A nice 6 volt sub C up front should do the trick. Lead screwed onto the motor mount. Heavy wheels/tires. Switches/servos, all your lucky stuff mounted as far forward as it will go. Two 6 volt sub C batteries and switches. What ever it takes!! Just for fun try getting any plane that had A round engine to CG. When I scratch build I have some tricks but with A kit or ARF you are stuck, not always with A kit I guess.