Your idea is fine.

I've made similar mods to planes like the old Great Planes "Ultra Sport" in the past, and later, rebuilt the wing to include normally-proportioned ailerons and slotted Fowler flaps. Both versions were acceptable.

This kind of modification is how a lot of us get started into scratch building, and won't make your plane "crazy" or "scary". Try them at high altitude first, and if you don't like what they do, then just leave them up. it's good to experiment. Have some fun!

If you decide to get "deep" into flaps, spoilers, etc., I have a few pages on my site dedicated to high-lift devices, at http://homepage.mac.com/mikejames/rc...ite/index.html

Also, see the thread just answered by "Tall Paul", with links to his methods. Lots of good info there! http://www.rcuniverse.com/forum/KI%2...2427323/tm.htm