Nice catch Vincent! Now comes the question from a weight saving point vs. strength point of view which system is better? Is a solid stab better than a built up stab? If the stab has an airfoil shape is it easier done with a built up or by sanding a solid piece? From a scale point of view which looks better? I know I'm opening the jumbo large economy size can of worms here but is there a better place to debate this when we have so many builders watching?
I will say on I have built stabs with solid sheets and a frame work. In the end I lean more toward a hybrid with a center balsa sheet with ribs on both sides with shaped edges to give the final shape. This can be planked or covered depending on the airplane being modeled.
Mike