Most of the assembly is covered in the video below, but there are a few things that need to be done first:

1. Solder leads onto the microswitch
2. Insert threaded inserts either with a soldering iron or with a press

This video covers all of the main steps of assembly:

You might notice that I haven't installed all of the screws... turns out I ran out of threaded inserts

You'll now have a complete abort handle that acts as a simple switch. From here you can wire it up to an Arduino, Raspberry Pi, computer or really anything