Just posted - track plans for running trains under the Tree during the holidays. These are layouts ranging from 4' by 4' to 5' by 5' and 4' by 6'. There are plans for O / O27, Atlas O (3-rail only), S, Standard Gauge, HO, N and G. Nice for the small space and limitations created by having a huge tree in the middle of things. Go to my site, scroll down to the O/O27 and there you will find the link to the layouts.
http://www.thortrains.net
http://www.thortrains.net