I bought the case in my local hardware store together with the aluminium sheet. It came with dividers which I later reused to create the compartment walls.

The sheet of aluminium was to wide, so I scribed and shortened it with a coping saw. However, a scrollsaw, rotary tool or even a grinder with a cut-off wheel might be a better fit, since it took me ages and I snapped two blades in the process. The gap in the front of the case is intentional. It provides space to place a powerbank and the memory stick.

After marking out where I wanted everything to go I drilled holes in the corners of the marked out sections and cut them out using the coping saw again. For the compartment section I tried a cut-off wheel on a grinder, and it worked fantastically. I used a metal file to trim the openings to fit the components and debur them. A quick pass with the orbital sander gave it all a matte finish. This is of course totally optional, I scuffed the aluminium plate up a lot, so sanding seemed good way to hide them and remove my sharpie markings.

The door to the compartment is simply a trimmed off piece of the leftover aluminium sheet.

I attached the hinge to the door and metal plate using the high bond glue. It's applied to both surfaces, allowed to cure for 10-20 min. and then both sides are pressed together. The bond is instant and there is no way to adjust the two pieces later on.

The keypad and LCD diplay hold in place with some hot glue around the sides. (Note: Make sure to isolate the pins of the components from the aluminium sheet. A dab of hot glue does the trick)

The keyswitch has a thread and nut, so I drilled a hole in the correct size and fit the switch through.

To make the compartment open automatically I attached the door and lock servos to the underside of the aluminium sheet with hotglue. The locking hook and opening lever and lock latch I bent to shape out of some brackets (similar to plubmers tape). In hinesight I could and probably should have 3D printed theese components as they are somewaht flimsy this way and will probably be the first thing to fail. I attached these parts with hotglue and high bond glue respectively (see pictures).

Because the front didn't look very pretty this way, I decided to print some frames to go around the different components and attached them with hot glue as well.