AGHRMatt posted:There was a layout in "101 Track Plans" that would be approximately 10x10 in O scale. As I recall, in H.O., it was 18" radius (approximately 33"-36" in O scale) and used a couple of bridges and scenic elements to disguise it's small size. Can't remember if it was two or three laps. I'll have to find my copy of the book, but the point is that even with a small spare bedroom in basement-deprived areas you can have a continuous-run O scale layout.
I almost wore out my copy of 101 Track Plans when I was growing up! 
I built one of the simple 4x8 plans back about 1970. I still have my copy, but it is packed away in a box along with my information on the Western Maryland Blackwater Canyon. Trouble is, the boxes are in the closet under the stairs to the basement, that I will have to empty to get to them. Well, that is a project I planned to do once I got the room in question. Thank you for the tip. While those plans lack accuracy, they at least can provide ideas.
