Using the 12 pound fishing line, tie it to the first nail. Now bring that line across the board to the first nail on the other side, and stitch it along the board as shown in the figure below. Tie it off at the end of the board when you finish. Now looking at the board you will have several lines running across the board. Done correctly, the stitches are evenly spaced up the board. Modelers commonly stitch it the wrong way (see figure on the right), leaving uneven, sloppy spacing.
He now covers the plastic sheet (that the strings are laying upon) with the thin paper medical tape. This tape is so thin that you can see through it. With this done, he uses a rotary cutter (a hobby knife can be used but use caution when cutting the strings as they will move under the tape) and cuts 3/16'' strips along the 24'' length of the board. We will call these Stitch Strips.