I make start gates, finish lines, and light trees. I don't get involved in modifying the MagicTrack, although I am quite familiar with it, and have samples of it here that I worked out design details and photographed assembly steps.
The thickness of the track material is only .056". If you countersink to make a flat head screw flush, there is going to be very little holding power. This is the basis of my earlier suggestion of using double sided foam tape as the assembly method.
One additional observation: The larger edge channel can be used as a cable duct if done right. But I did have a problem reported to me: I use modular cable, and it goes in fine, but you can't get it back out the way you put it in. For future Magic customers, I will be supplying modular plug on at one end, and stripped and tinned wires at other end. I will supply a terminal block. This way, the cable goes in the slot, but is pulled out the full length of the track when disassembled.
Maker of The Judge