.15 ARF trainer
#2
That's going to be hard to come by, and not really a great trainer either. I have a Mini Telemaster which serves well as a trainer, but it takes a park 450 size motor. the .15-.25 size planes are a hole in the market, too big for most looking for park flyers but too small to satisfy glow pilots. If it's possible for you, I'll suggest going bigger. I understand you want to use the motor you have, but it doesn't really make sense to put a whole package together just to be able to utilize a $30 motor.
#3

My Feedback: (5)
Saw this one on Ebay. ARF trainer called a Schoolboy. It comes with a motor, but if you can get it cheap, what-the-heck.
Vintage Hobby Shack ARF Schoolboy RC Airplane Model Kit 50 inch Wingspan
Vintage Hobby Shack ARF Schoolboy RC Airplane Model Kit 50 inch Wingspan



