I'm more or less into a rugged construction, here some pics of my current project, an old Avonds DF F-15 which i'm modifying to "full scale" and dual KJ-66 turbine power. The airbrake is a selfmade carbon fiber / glass composite structure with hinge points at the scale location. The "hinge" is simply a steel wire going through the entire structure (uncut piece with overlength can be seen extending out of the fuselage in the second photo below). Bearings are simply small brass tubes epoxied into the airbrake carbon fiber "extension arms".
Take a look at the pictures....calculations show this will extend up to speeds of 130mph with the servo used (Extending 62°).

Greets