Tetbury Engine Shed pre 1922/23 alterations

[Blobrick]

I wonder if anyone can help please?

 

I am currently build a 7mm scale model of Tetbury engine shed, using a Timber Tracks kit as a basis. I am attempting to back date the model to its pre 1922/23 modifications, when the GWR raised the water tank at the rear of the shed by 6'6''.  I am having difficulty in locating photos of the shed in its original condition. I have a copy of The Tetbury Branch by S Randolph, unfortunately the two early photos which show the shed are taken from the station end of the layout and only show the rear of the shed with unaltered water tank, abet at a distance. 

If anyone knows of any other possible sources of old views of the shed, l would be most grateful.

 

Bob C