Here's a link to the Falcon page on flickr.
https://www.flickr.com/groups/1659129@N20/
One of the pics is of the driver's position. I have Brush drawings for that too, but not for the bulkhead. AFAIK, the bulkheads were very similar to the eventual class 47.
There are plenty of photos of Falcon in it's original liveries, ex-works etc, but once she was in blue, she wasn't much loved, so not kept particularly clean...but then...what locos were?
I also have other Brush drawings if you need them.
PS: quite a few more images if you Google Images: D1200 Falcon, 1200 Falcon or D0280 Falcon.
You just need to sort out the real ones from the model.
Seems a popular model...."O" gauge manufacturers...are you listening???