Getting there with the cockpit, the seat belts are AIMS Gladiator ones. I've added a couple of random placards.

1 attached image. Click to enlarge.

This cockpit looks wonderful, my friend @maxw!

A little work on the IP(s)...it's going to be a bit of a mongrel! The AIMS Gladiator is clearly not 100% accurate as I knew it wouldn't be, but it's better than the Silver Wings one which is very much based on the surviving Finnish Gauntlet which is not typical of 1930's Gauntlets. So I'm opting for the AIMS main IP. But the SW lower one more like a Gauntlet one than the AIMS offering.

And a slightly puzzling photo of a line up of Gauntlets; you can see what appears to be the "firebird" symbol on the tail fin of the second plane which definitely suggest 56 Squadron, but "On Silver Wings" says these were allocated to 19 Squadron. Further investigation required!
OK, so it's not the 56 Squadron phoenix, but 19's dolphin between wings, apparently adopted because the squadron flew Sopwith Dolphins in 1918. Excitement over!

2 attached images. Click to enlarge.

Looking forward to more great progress as soon as you’ve solved this conundrum, Max @maxw.

Close inspection of period photos of Gauntlets show "bumps" around the interior circumference of the collector ring:

1 attached image. Click to enlarge.

I have cut off the existing pipes so more cogitation about how to replicate the set-up, I'm thinking Milliput or similar made into thin "sausages" then moulded onto the collector ring. The engine meanwhile is pretty much ready, just the oil drain to add at 6 o'clock:

1 attached image. Click to enlarge.

Quit cogitating so much, and do some thinkin'!

Mmmm, sausages, being in China I really miss a good old English banger, I don’t think I fancy a Miliput sausage though. Keep up the good work, Max @maxw.