Nice! I built a b-17 flying fortress once. It was much bigger, though.... I wish I had that window you have for the nose(they're clear on most b-17s to allow for the nose gunner to be able to see). Anyway, nice plane!
I'm sorry, but I don't like this... as a plane. I do think it would make a nice armored vehicle though. You should take the wings and tail off, shorten the protruding plates in the front, and add tires.
(My first attempt at constructive criticism)