Nubie Second Plane
Ruralflyer:
You are asking for something that is rare to the point of being nonexistent.
There are many kits for high performance electrics, and many kits for good aileron trainers with wet power. But an electric aileron trainer is another matter entirely.
If you have good local electric assistance a conversion will do you very well, but I would not recommend doing the conversion as a newbie - just too many problems that can arise.
That having been said, almost any good .15 sized plane can be converted using relatively inexpensive motor/ESC equipment.
If you have an instructor go straight to a better airplane, for example an "ElectroStreak." With the stock supplied motor it's a good flying plane, and not terribly hard to fly. When you get tired of the moderate performance, a cobalt 05 motor replacement will make it a rocketship.
Actually, if you are comfortable with your first plane you could probably transition without difficulty, being careful not to overcontrol it.
Another possibility is the "Wasp," but that one is available as plans only, and it's elevator/aileron - no rudder - the ElectroStreak is more what you want.
Bill.
ElectroStreak: (lousy picture)