Kit 18 - Final Drive

I haven’t got much to say yet about this kit. I haven’t even got my tender fitted but I think I can still test fit the parts and the wheels to see whether the wheel retaining collars will need to be shaved down a bit in my lathe, in order to get the right clearance. Do any of the toothed drive wheels or the brake drum get painted ? I can’t really see what others have done from pictures - and I know that there is a painted cover on both sides, so maybe you can’t really see any of the drive wheels when everything is assembled ?  Any tips or input will be appreciated !!