Outside frame, 1' x 4'. Fold-up design using hinges. Watch here for more details as they come available. Two conductor brown lamp cord is a good choice. Electrical connection between modules is by automotive-type double wire symmetrical plugs.
Plugs are color-coded to identify proper mainline wires.
This allows you to chose between the rear mainline power or your local power. No local siding electrical power is allowed to be directed into the mainlines. To bypass this for home use you may have a special plug or switch under your module which is to be disconnected at club meets. You may use any type of plug to connect your siding power between dependent modules. Mainlines are tracks that run through all modules and are controlled by the club.