I worked on an F4D-1 (a.k.a. F-6A) while attending an aircraft
mechanics school in Denver. This particular aircraft is now on display
at the Weisbrod Aircraft Museum in Pueblo, CO
With that said, I remember that the entire cockpit was semi-gloss
black. I have also seen photos showing it to be dark gull gray with
black main and side instrument panels and a black seat.
A cockpit detail often missed are two vertical metal bracing rods, one
on each side of the interior of the canopy side window panels. If you
sit in the cockpit, these rods are very prominent.
Another interesting feature of the Skyray cockpit is the extendable
joystick. The control stick can be extended by pulling the grip up
about 8 to 10 inches. This gave the pilot additional control leverage.