More good progress James and it's looking good. The interior colour is a mute point, I saw a modellers image of the interior in black with highlighted framework, similar to yours which looked really good which I may follow?
But when I did my Swordfish my research showed the interior fabric to be a pinkish colour due to the dope used to taughten the fabric outer skin!
Hence this is 1 of the reasons why I have only just started to assemble the wings until I decide exactly which direction I'm going lol
It's up to you what you follow, but Airfix I suspect got most of the information from Brooklands (from the original drawings) and have based the Wimpy interior colour scheme on the Factory Specs which would be correct for when the flew from the factory.
However, whether the interior colours stayed like that once a Squadron's Ground Crews got hold of them - I doubt it. They were used for night bombing, so the crews wouldn't want shiney surfaces that could give them away in searchlights.