RN Historic Flight Sea Fury Info Required

After completing the 1/4 scale model of Spitfire AR213 earlier this year, myself and Phil from Fighteraces have been working on a 1/4 scale Sea Fury, to be powered by a 250cc radial ( see below ).

The picture was taken about a month ago, but we are now in the final stages of detailing, but can’t find any reference to the colour of the inside of the flaps. Does anyone know if they are bare metal or painted, and if so, what colour?

Any help or pictures welcome,

Thanks

Steve