I would have to check the plans to sure I understand this, but for certain many have been built this way. An alternative would be to build it as designed but put a layer of carbon mat between the sides and the engine bearer/1/8" doubler and such. Lots of models been built with no ply doubler, but just a sandwich of the fuse side, carbon mat,hard balsa doubler then engine bearer.
Type at you later,
Dan McEntee