Excellent in-depth post by Rick_Skateboard. I've been meaning to post regarding the height of the spotlight and corner handrails but you beat me to it.
Great to hear from Fran that they are trying to do something about the light. I would agree that the corner handrails are too tall though.
Just a few more items of feedback I don't think has been covered:
Is it possible for the lights in the headcode boxes to be more opaque? They look a little too clear.
Specifically on 43043, the nose of the prototype only has the OH warning flash label on one side at the radiator end, none at the engine end. The sample shown by Accurascale shows two at the radiator end.
On 37043 again, the mesh in the side radiator grilles looks to be black on the prototype but is blue on the sample.