Welcome to the Forum Don.
If you follow this link within the Forum you should find the thread on my modular layout:
http://www.railwayforum.net/showthread.php?t=10452
This is part of a bigger scheme at my Club. It is also, following an unplanned move, going to form the basis of my layout at home. I haven't updated the thread for a bit so there is more to report. Will try to get round to it soon.
Each board is 1100mm x 50mm.
Hope it gives you some ideas.
Best wishes,
John H-T.