I built F-22s for a while. Nice plane, but a little expensive. Most of the trapezoids are for stealth (look at how many parallel leading edges there are on the thing).
But... Trapezoidal surfaces are also all over the P-51 (and Tailwind), so you may be on to something. Besides, Steve liked to Simplicate when he could, and a trapezoid is easier to fabricate than a curved stabilizer.
I like the airfoil empennage. The Bearhawks have that as well to help provide more control authority from the same square footage., or conversely to get the same authority from less sq footage (and therefore a bit less drag).
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