Missed this thread somehow. Excellent work Colin, it seems vaguely familiar.....

http://leadadventureforum.com/index.php?topic=7181.0Mine was intended as a backdrop for the table edge before I went mad and did both sides.

I can't believe that almost no-one has berated you for your brick-scribing insanity. I guess it has become (almost) normal behavior now.
My brother says it looks like a prison so I will make signs for that.
One of the things I have on a long list for Geezers (at some time...) is a prison exterior (HMP Slade) as a start point for escape scenarios.
I considered changeable signs using mag-basing on the walls/signs of my buildings, but eventually didnt go for it.