I'm sure that I read somewhere before that the bar major errors the 3D models for BoB had been frozen. (Please correct me if I'm wrong I went searching for the post but couldn't find it!

)
Given that there is only one flyable MK1 left and a handfull of Mk1's on static display I (Most having been scrapped or converted into later models) I doubt this issue will be resolved to the satisfaction of everyone.
I, never having been given the opportunity to look into the cockpit of a MK1 Spitfire, would blissfully enjoy the sim in my ignorance even if they gave us an X-Wing pit!
On the otherhand you have a variety of people who have studied some of the survivors and documentation and each have a perfectly valid though different description of a Mk1 cockpit that they would like to see implemented. Like I said not everyone is going to be happy.
Maybe if the developers could post a list of the documents/aircraft that they used as the basis for their models everyone would at least be assured that what they have modeled is an authentic representation of a MK1 Spitfire.
Just a thought
Cheers!