I wouldn't be too concerned with following any standard other than maybe the connections between each module, such as the use of the Atlas 5" sectional tracks and the electrical connections.

Are you thinking about having track elevation changes? If not, the first thing I'd to do is to just sketch a single line loop around the modules to check the basic fit/look for continuous running. This will also help define where it would make some sense for sidings and such.

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Bruce (McToots) McElhoe
KAMRI President
and Web Site Moderator