Yaw-Enabled Split Control Surfaces for B-2 Reconstructions and Airbrakes [Pre-WIP]

[gkorgood]

I've had this idea for a mod for a while now, but I'm lost as to how it may be implemented. I'd like to create a stock-alike control surface that, for pitch and roll commands, functions normally, but when is told to yaw while still in a horizontal placement, splits into two pieces, as in the following pictures:

I can do modelling and texturing starting in a few weeks, once school is over, but I'd like some input/advice/assistance as to how one might implement such a part in Kerbal.