just a thought goose. use the rds to drive the center flap and attach the others with a piece of golden rod. it will flex when they spread from each other.
I've used the plastic rds but don't have alot of faith in them. on my meister p-47 i'm using these couplers that are offered by servo city.
http://www.servocity.com/html/servo_..._couplers.html
just my 2 cents, bird looks good! hey what happened to the p-51 build?