Most instructions give dimensions and instructions for scoring but I have included these in the MTC file. If you prefer to hand score, you can turn off the eye to the score layer and use the guides instead.
I actually used the guide notches and my MS scoring board to score the marks. You should be able to see the guide notches below.
Edited to add: There has been a complaint that I did not credit appropriately. This idea is NOT original to me but the file is my original design. I used the dimensions from this video to design the file and Dawn's original video was posted in May 2008. As I said, this idea has been around a long time!