The most recent one was for ten aluminum cabinets. The instructions said they would be mounted inside a airplanes cockpit with aerospace fasteners. It didn't mention what it would be used for. A place to store the black box maybe, although I highly doubt it.
The frame of the box was made out of thick aluminum angles. the frame was assemble and held together with special fasteners. It then was TIG welded and grind. After this it was sent for inspection, if approved it would be sent back. The next part was to attach aluminum sheet metal to the outside of the frame, on five sides. The last side was for a door, that we didn't make. The five panels were also attached using special fasteners.
It's always fun to do these types of projects, although I wish I new what type of plane, they would be going on. That would even help me pick what flight I want. Just so I could tell the story.