The idea of it being inside a container is interesting too, given how ubiquitous they are. You could have one on a transport ship or just sitting at a dock somewhere, undetectable until it's needed.
and it has this insane workshop where the different parts of a missile are assembled below deck and then slid out through some bombproof doors to the launcher.
Today a missile ship doesn’t have all that drama and so many sailors messing with missiles, they just push a button and a door opens and the missile comes out.