Janet, Welcome.

Are you planning to make it a glow powered plane, or electric?
You may concider enlarging the plans (Convertable) to fit your needs. However, if you go that route, be sure to strengthen the appropriate areas. (landing gear mount, motor/engine mount ect.)
You've stated that you have built some of these, so it should be noooooo problem.

Jetts

P.S. check out the thread in the "Clubhouse" section, named "This one is just for fun", for a chance to win a GWS "Pico stick" park flyer!