Storing and transport of small modules

For my larger modules I have shells made from 1/4 inch plywood that bolt on to the module frame and form a crate that protects everything on the module but what about a small module like the small extension to the Musashi-Koyama AsiaNrail modules that I have been working on.

I have found that for the small modules I like to make a custom cardboard box.  Here is the small extension module in it's box ready to go to the up coming Los Altos Train Days show.   This box was cut down from an empty wine case.

To secure the module within the box I used the 1/4-20 tee nuts that are already on the module and secure the module with two bolts through holes made in the box.  The same method is used for the small transition module between Ntrak and AsiaNrail.