Rocket Motor storage box
I was at the army surplus store recently and picked up a couple of these old ammo boxes. They were going out for $5 each. Over the weekend I attacked it with some 'goo off' and was able to remove the markings that had been sprayed on without damaging the original green paint.
I then laser-cut a stencil & gave it a new use!
The only thing left to do is to line it with MDF so it's safe to use. Once it's lined, it will perfectly fit 18mm motors across it's width.