Unlike other domes, no sanding should be needed. Because of the tooling/spinning process, these things fit together almost perfectly right off the bat. The days of cutting the inner dome are done, instead
First, I traced the top circle. Then, I went down and traced the HP holes. I then had to go back and tape some of the PSI panels back to where they belong. I also used the cut-out pie
Once this is done, get out the drill. An easy, but time-consuming, way to cut out the holes and panels is to drill lots of tiny holes all the way around the inside perimeter of the lines you have drawn. Once you do that, break out the file (half fround will do the job) and start finishing what is left. You can get as details as you want, but know that you will be filing off a significant amount of material at this point. If you have a mask, use