I came across a model I made some time ago just for interest when I did not have a layout: Stamford Engine Shed in N gauge based on the Prototype Kit:
I scanned in the original Prototype kit and then used The Gimp to replace all of the brick surfaces with a Scalescenes equivalent. The roof tiles were replaced using the same technique with a home made slate paper made from a photo of the roof of the school at the Beamish Museum. The water tank sides were drawn from scratch