Hey Don
I took a look at one I got from Tower Hobbies a month or so ago (needed 10 bucks more for free shipping) and it too has the extra parts. The engines seemed a little different-the large pipe running down the side was different and the detail was a little crisper on one side than the other. I mainly bought it for nostalgia. I picked one up at the Denver airport in the early 70's when I got to go there with a friend whose dad owned a Bonanza. Update your build progress I will be interested!