That photo:
That particular plane is a restored example photographed at a recent air show. As such, I would be skeptical of its provenance without other corrobarative research.
As I recall the gear extension sequence, all the doors (except for those directly attached to the gear) closed as soon as full extension was achieved. This made the aircraft more controllable during the critical carrier landing/controlled crash phase. The few photos I have found of parked operational birds show all the doors up.
Navy standard painting procedures for the period called for white epoxy on all (occasionally exposed) interior surfaces. The edges of gear doors, slat tracks and such were painted red to warn deck crew of the potential for injury.
The few areas painted solid red, such as the interior of dive brakes, were universally hated by crew chiefs because of the difficulty in spotting hydraulic leaks, which show up quickly on white surfaces. Such surfaces were painted red as a signal to other aircraft in the flight that one of them was jammin on the brakes.
And (humble grovelling) I was mistaken about the hinging of the gear door. The main doors hinge at the centerline; that interference door hinges just as you have it. I'm pretty sure the little door would be closed up as soon as possible. during landing so that it did not become another dive brake.
BTW, the new Detail & Scale book is a pretty fair reference, as are the FJ-series of books by Steve Ginter.
Phil Schenfeld