Border pick-up recipe: Made a gauge swatch in moss stitch to find that 15 moss stitches with size 6 needles equalled 25 rows of intarsia.
Ratio = 15/25 = 0.6X

Sides have 525 rows + 3 points of the zigzag turns. Rounding to 526 x 0.6 = 315. I picked up 315 stitches on each long side and knit 5 rows before binding off on right side. This pick up is, basically: (K1, skip 1, K2, skip 1), repeat.

I then picked up the provisional cast-on/held stitches at the short ends and knit moss stitch for 6 rows with size 5 needles, before binding off on right side in moss stitch.

Using my mid-gauge Taitexma TH-160 for this intarsia wrap. Omitting moss stitch edges (impossible on machine) and going to pick up and handknit them at the end.

A very simple intarsia chart -- each stitch moves one over each row, at the same cadence.