Thought I'd post periodical updates on the progress of the map, so you can see how I made it.
Here's what I've done so far, in 3 days (bear in mind I only spend about an hour or two a night mapping these days):
Day 1:
http://www.btinternet.com/~ydisss/progress/day1.jpg
Built bridge and started north loop of road.
Day 3:
http://www.btinternet.com/~ydisss/progress/day3.jpg
http://www.btinternet.com/~ydisss/progress/day3a.jpg
Completed bridge and started on buildings inside northern loop.
I'll post here every now and then with new pics of the map as it develops.