I have discovered a section of the Kato Japanese website that is featuring some great track plans for Unitrack and Unitram in both N scale and H0. You can find it here:
http://www.katomodels.com/unitrackplan/
It is currently being updated every week and at the moment is showing some Unitram plans. Some of the compact N scale layouts are also quite good.
There is also a great layout design based on the Toyama tram route in the Unitram section:
http://www.katomodels.com/unitram/layout.shtml