To transport the module boards safely, I made some transit boards out of off-cuts of 12mm MDF. These were always going to be a Mark 1 version, consisting simply of a square with a line of holes drilled to match those on the interface plate on opposite faces and a hand hole in the middle.
These worked, and well, holding the boards a small distance apart and making them easy to load. However, very quickly two limitations were noticed.
Firstly, the hand holes are all but useless, because the boards are held so close together that there’s nothing for your fingers to grab hold of anything. However, I don’t intend to do anything about that, because these are Mark 1 and were going to be replaced later with newer ones out of thinner ply.
And that was the other weakness. The 12mm MDF meant that the bolts, when used with two washers to protect the wood, were difficult to engage the wing nuts and, when done up, only just picked up enough threads to be secure. The solution was simple; embed tee nuts into the transit boards. It works a treat, but is still Mark 1.