The differences in this watchband version and the previous one, are a four strand core that's paired off and knotted around, and it's made in two sections, so no strands run across the underside of the watch.
Each section of paracord was tied between the watch pins and one half of the 5/8" side release buckle. So sizing is in three measurements, of each of the two paracord sections and the space between the watch pins across the back side of the watch.
I started with a six foot length of paracord for each side of the band, and ended up using between 10 and 11 of those 12 feet of paracord in the end.
I tucked the end strands into the knot work on the underside of the band to finish, and they can be further secured with sewing needle and thread, melting, or a drop of super glue.