Hi Willy,
The backscene is freehand painted by yours truly- some of it I'm happy with.I've got more backscene to do on the other side of the shed and I'm not sure whether to carry on with the paintbrush or use some of the new photo backscenes i.e. Gaugemasters and the like. The one thing about doing it yourself is that it can fit very specifically to what's built in front, and, of course, nobody else has got one like it!
The brick arches are scratch built from Metcalfe papers onto a hardboard frame, but if I was doing it again I'd use Scalescenes kits.
Best wishes