I made this to give my interior a custom look. It turned out great.
Check out the instructional video of how to put it together at https://www.youtube.com/watch?v=-38LASkvTYc
The letters are a little bit big, unfortunately, to fit into their holes. I had to do a lot filing and actually took off the bottom few layers to get them to fit in to the knob. It might be worth a shot to try scaling them down to around 95% and see how that goes.
You will need an M12-1.25 nut (I would recommend a nylock, which I did not use, so you can more easily adjust its alignment once it gets tight), 6 m3x20mm bolts and 6 m3 nuts.