Hello Chris,
As a relative newcomer I've followed this thread and your Tonfanau thread with great interest and found much inspiration in both. Hope you don't mind a beginner's question but can I ask you to expand on the method and paint colours used on Tonfanau signalbox's brickwork? I also have the Peco box to adapt, to a South Gloucestershire style for my railway 'Dill's Bridge'.