Fliskits Pheord X150 Build Part 5 Shroud Scoring

Step 9 has you cut out the shroud. 
You might find it easier to make the score lines before cutting out the shroud.

Step 10 has you cut halfway through the fold lines in the shroud.
A prefer to do a "blind emboss" on the score lines with no cutting.

The backside of a single edge razor blade works well for this. You could also use the non-serrated area of a butter knife.
Put plenty of tape layers over the sharp blade edge so there is no chance of cutting your fingers.
The rolled over metal "top" of the razor blade is flipped over and pressed down. Run the smooth rolled edge over the fold lines.
Don't press too hard, you don't want to scratch the print.

To get a cleaner crease, the straight folds were pressed over a straightedge ruler.