Note: Do not use magnets if you want to use a magnetometer or other sensors that are sensitive to magnetic fields in your setup. The position of the magnets and reed switches can also be problematic if you want to use a magnetic charging cable/port (which I unfortunately realized too late).

The brass hinges don't have much friction, so I decided to add small neodymium magnets to the frame of the door and the main shell to keep the door closed when it's closed. I drew marks on the sides so the magnets would meet, and then drilled 3.5 mm holes (the magnets I used have a diameter of 3 mm).

Then I glued the magnets in place with a drop of ultra-strong 2-component epoxy and let it dry. After a few hours, I applied a thicker layer of epoxy glue (in the main shell also from the back/inside) and then let it dry overnight. The next day I sanded the glue spots smooth (didn't take photos of it).

Note: The magnets I used aren't strong enough to hold the weight of the door when you turn the closed Tricorder upside down. I recommend using stronger or larger or multiple magnets to hold the door closed.

I'm using two reed switches in my electronics to trigger functions depending on the status of the door. One reed switch (and associated magnet) is located between the hinges. Since I only had the small magnets on hand, I added three of them to the door after drilling holes for them between the hinges.

I carved a recess in the main shell for the lower reed switch. This recess is not exactly in the middle, but slightly offset to the left. As a result, the left hole for the cable feed-through into the interior is exactly in the center of the left hinge and does not interfere with the hinge screws.

After soldering wires to the ends of the reed switch, I temporarily fixed it from the inside with hot glue. Then I applied 2-component epoxy from the outside to fix it permanently and fill the gaps. After the epoxy glue had dried overnight, I carefully removed the hot glue inside and sanded the epoxy glue outside smooth.

I also glued the black USB socket housing back in place and fixed the yellow reed switch cables inside with epoxy. Later I also glued the second reed switch to its position behind the slanted buttons above the display. I decided to glue the reed switches in permanently, even though I might regret it.

Initially, I had positioned the magnets for the upper reed switch in the middle of the lower side of the door, in the area of the nameplate. After the reed switch was glued in place, I did a simple functional test with an LED and found that the reed switch did not respond to the magnets. So I removed the magnets in the door again and glued them a little further to the right in the already existing hole. Thus the reed switch worked.

Inside the main shell, I later used a high-speed cutter and sandpaper to remove some of the epoxy I had used to glue the side magnets (that hold the door closed). This was necessary so that the TFT display can be pushed in flat and so that there is enough space for the alpha-to-delta lights on the other side. (I only took close-up pictures before, not after the removal/sanding...)

When I started the project, I had modified the scanner pocket thinking that I would position the touch sensor breakout and main power switch on the front of the scanner pocket. This idea is now obsolete. The DotStar Matrix and NeoPixel stick are located in the front area, there is no room for other things there. So I removed the screw nuts on the scanner pocket again and closed the main switch hole with epoxy.

Note: I later replaced the back lid and changed from a Mark X to a Mark IX (without a scanner pocket).