I'm kind of thinking I'd like to make a few billboards for the layout. Funny I can even remember the name of the company who owned them around here in the 50's and 60's, I know they are big, but I have no idea of the dimensions. I think the older ones have a bit more class than what you see on the sides of the roads today (if any). I have lots of pictures of old billboards I got off the net, but I have no idea of what measurements to use for an HO size billboard. Even a good guess is better than nothing.