The problem with this design solution is that it results in a very ugly plane.
And a very high loss of wing lift! I would think this aircraft did not make production because of poor stall performance and in a "Deep Stall", undoubtedly the elevator would lose control much more quicker than a "clean" wing. Most designers want the wing to stall from the fuselage outward, where you can maintain wings level attitude, until the whole wing stops producing lift, hence you will get a aircraft with straight ahead stall feature. Some of the high performance aircraft actually had a different angle of incidence at the fuselage than at the wing tip, just to produce a straight ahead stall. Some aircraft had "stall strips" installed on the wing to force the wing to stall first in certain area's to promote a stright ahead stall. Anything on top of a wing, other than the wing surface, is going to effect the performance of the wing!
