Your model buildings are of a very high standard, but can I just add a cautionary note about Scottish brickwork. Your use of commercially available embossed brick sheets for Scottish buildings is not authentic: in the 19th century, by far the most dominant brickwork to be seen in Scotland on all brick-built public and industrial buildings - including the buildings of all the Scottish railway companies - was what has been called 'Scottish Bond', which consisted of 3 (but also occasionally 4 or 5) stretcher courses for every header course. This pattern was almost totally absent from English practice, where it was only used for garden walls. Walls where the brickwork is entirely stretcher bond indicate cavity wall construction, and are not really representative of 19th century origin.
Alan