Here are the pictures of my upper doors. The center bar is hinged to both doors so the 2 doors and the center bar are all connected as 1 piece. I've taken pictures of the hinge system. The front has a key that operates a locking mechanism on the interior side of the doors. The Center beam has 2 pins which slide into 2 holed above the rear window and then the front of the center beam comes down against the windshield header and a small plate is fastened with 2 quick release bolts that secure the front of the center beam to the windshield frame.
Let me know if you need any other close up or other angles on this.