Awww - lovely pics of one of the nicest places I have ever been. The Chipmunk is lovely to fly in, lovely to fly, and lovely to watch, whether live or on youtube, some of the best aerobatic displays are careful energy management in Chippies, and that engine sound is a glorious reminder of hot summer days on grassy airfields.
My recollection of interior cockpit colour is all black in RAF aircraft of the 1957-61 era. I guess this might be linked with daytime night-flying practice, using orange cockpit panels combined with blue goggles.
The green colour mentioned would be zinc chromate primer which protected the aluminium airframe from corrosion. This is nominally a pale green but was often modified by additives, as here:
Everything You Need To Know About Zinc Chromate
There is quite a lot of information about zinc chromate colour on model-makers' sites.