I'm currently reading 'Country Branch Line', Paul Karau & Chris Turner's 2 volume history of the Watlington Branch, published by Wild Swan. It's an absolutely superb and highly detailed account of the line and I can't recommend it highly enough.
Working from the (roughly to scale) 1948 track plan in Paul Karau's earlier (and also excellent) book 'Great Western Branch Line Termini' (OPC), I've worked out how the terminus would scale into 4mm:
The grey grid lines represent 1ft spacings, with the red lines showing how the entire station area could be comfortably accommodated on 3 4'x2' baseboards without requiring any compression at all.
Definitely one to consider for the future. And having actually got into reading a detailed line history like this I am now beginning to understand the reason people choose to model a real location rather than something made up.