Ever since I completed my Cygnar battle engine, I had an issue of how to transport it. The previous case I used for Circle Orboros celestial fulcrum wasnt deep enough for the Storm Strider.
Here is the solution:
Old army surplus ammo box (you can probably get this or something similar anywhere) and layered cut out foam.
The case is large enough to carry 4 giant base models, so my (still only planned) two battle engines and two colossal will be carried around safely :)