Something I've been working on for years is a navalised Supermarine Swift. Pulled it back out from a drawer a while ago and started it again. Cockpit is coming together, and I've got basic interior bits on the go.
Baby steps. Instrument panel started, with reflective gun sight.
Ejection seat
Head rest
Creating seat cushions. Some thick foil from a wine bottle seal. Crumple it up a bit...
Glue it to the seat and give it some pokes with a round toothpick...
And here's the seat. Not perfect by any means, but it'll do for me. The photos on Thunder and Lightnings show a sort of tan colour to the cushions, Tamiya Flat Flesh seemed like a close approximation. The belts are also wine bottle foil, photos show that the seat belts were grey and the shoulder belts white.