Stuka MG42 in tail position will hit the elevators on the tail when in all-the-way-down position. Not the tail it's self, but the part under the tail.
The Ju88 bottom gunner position will hit the plane when it is all the way up, but the crosshairs are nowhere near the plane and there's nothing underneath the plane to hit. The cannons are firing from the wrong spot.
I'll get some screenshots in here in a second to show what my crazy ramblings are about.
Here they are.
Notice the damage on the ju88. That was from me shooting myself with the bottom turret. I think the problem is that the collision meshes for the landing gear don't go into the plane when it's flying, so you hit the invisible box and it takes damage.
The stuka is clearly not aiming at the lower elevator but it's hitting it. This also hurts the stuka badly.
And finally, the ju88 has a missing texture on the side.
Good eye. I probably wouldn't have seen that.
*bump* I'll post more bugs once I find them.