We have a side door no one ever uses. We just use the area for storage. Just in case of a zombie attack, I would like to fortify the door. I'm brainstorming ideas. I'm aware of products that reinforce the door jam but I want to take it a step further and put a removable 6" x 6" piece of wood that braces the door closed.
The benefit my idea (shown below) is that we can still use the space above and below the 6" x 6" for storage.
Here is my diagram. Please offer any alternate ideas or comments.