Mike,

I added flaps on my Avonds although as of yet it is still unflown. If you want to see how I did it you can go here:

http://www.rcuniverse.com/forum/fb.asp?m=1196432

I know Geoff Wallace and Mike Cherry also added flaps to theirs.

The wing is soooo thin out at the ailerons, I don't think I would attempt the ailerons. (someone here in the states did do ailerons though) Everything I have heard about the Avonds they are just not required. The full scale aircraft gets the majority of the roll control from the stabilators anyway. I plan on adding a mix to allow the flaps to provide some measure of roll control should for some reason I lose one of the stabs.

For that matter, flaps are not required either but I love the scale look.