I'll post a pic of what I am trying to do once I get home. It will likely make this a little easier to understand.

I have two competing ideas, one uses the track idea where the flap follows two grooves cut into a rib. The other uses a linkage to turn the flap down and a groove move the flap back. One of the issues is only having about .3 inches to work with for total height. It's a 25% of chord flap on a 6 inch chord with a 25% of chord airbrake starting at about 60% of chord. There is a .5" overlap of the airbrake and flap. Like I said, pics to come...