I was just reading a few posts on another site about home-made cases for locomotives and decided to post links to a couple of my designs to give folks some ideas.
Here is the case for my K-27 that doubles a a maintenance cradle for working on the underside.
http://www.rhyman.org/archives/274
Here is the case for my C-19 that is much lighter weight.
http://www.rhyman.org/archives/534
Bob