While I may still be thwarted by time and space, my extension to Maudetown Colliery has begun in modest terms. I'm thinking about adding an extra level of low relief buildings atop the NCB's engineering workshops. Making use of the excellent Ten Commandments cast plaster facades, the extra two storeys adds a much more convincing vista to the original baseboard's backdrop; balancing nicely with the tall winding tower and washery plant.
Also from Ten Commandments, are the individual 'northlight' roof panels - these are reversible to suit whichever direction is deemed to be north on your layout, with finely rendered brick detail on both sides. The plaster sections just need a little filler to seal any gaps before painting and weathering.