-The wing mechanism still looks confusing but the guns at the wing tips show that the top gun fits inside the lower gun's wing mount somehow. There's a curve there... It'd limit the thickness of the wings presumably. Interesting. It looks more now like it splits at the engine too, but it's still hard to see.
I don't see how the wings split. There is no line on the actual wing. The back landing gear would have room to go inside the wings if they didn't split.
I don't think the ship takes an astromech. They would have shown a happy R2 unit up there if it did just to take us all freak out.