Did I need a protractor? No. Was this a fun project? Yes! I haven't used a protractor in over 15 years, but I also didn't want to create just a ruler. I thought it would be fun to make something that I haven't seen in a while. I might end up making a set with a ruler and right angle ruler too, just for fun! All I used was some 1.5MM scrap basswood and clear satin polycrylic. See below for how I did this project. If I had to do it over, I would make my power settings for the engraving a little higher so they are a bit deeper. I would also redo the tracing on the numbers, as they came out a bit distorted.
**The reason you want to do your cut line last is because you don't want the material to move around after it has been cut to avoid your engravings getting messed up.