Funny thing, just when you posted this I was thinking the same thing. However, a couple of glitches with the this theory. First the model wing does have the same profile as a C-46 OUTER wing, but where is the straight inner wing section? Second the picture of the horizontal stabilizers are not distorted. Third the vertical stabilizer is more Boeing shaped than Curtiss shaped. Curtiss rudders for the most part had a round trailing edge shape. The rudder on a Boeing Stratoliner was designed straight at the back. Fourth the fuselage is completely the wrong shape for a Curtiss C-46. The fuselage side should be "double bubble" shaped. Also I noticed on the C-46, the fuselage comes to a point the closer you get to the nose. The Boeing Stratoliner is more blunt, like this model is.
One possibility, one of the previous owners thought it was/wanted to make it a C-46 and thus modified the wings. There are heavier carving and sanding marks on the wings than any where else on the model. If the top down view of a Stratoliner wing is larger than what is currently the wing on this model, than this theory could be true.
-David