The way I understand the mechanics of the battery latch assembly, there is an interconnect between the red forward side buttons and the red aft latch sections. I would also expect a separation between the left and right sides, which is currently not in effect with the red aft latch sections. If you can locate any 3D model file which accurately represents that separation and interconnection, regardless of the rest of the model, it would be useful to determine the modification required on your current model.