Update: I have added the nose of a rocket that is launched. Use it in your game like this:

Have the launch hatch closed. Stop the rocket from launching.
The hatch opens (remove the hatch), destroy it before the rocket is launched.
The rocket is launching (place the rocket nose in the opening). You get one final shot.
You have lost.
Just because I launched a Kickstarter doesn't mean I will stop publishing free models here.
https://www.kickstarter.com/projects/terrain4print/terrain-4-print?ref=cjzwfk

This is a launch hatch for ballistic missiles. The actual hatch where the missile comes up is loose. Print a box (supplied) and glue it to the bottom of the hatch. Place it in the hole. Now you can push it down on one side and lift it up to make it "open". I will supply a missile coming up later. So you can have a scenario counting down to launch. One side could protect the launcher before the missile launches.