[Speckul8r]

I suspect that another thing to look at is the door alignment. If the front shell is too low, the door halves wont come together. If too high, I'd think there would be a lot of gap. Of course, this assumes the TM is level and square. If the door connects, opens and closes correctly, then I'd look at the rear shell.
I've had the front support on the front shell slip a tad and my door halves would not mesh.