I knit this in a thicker yarn & larger needles than called for in the pattern; DK weight, 4.5mm needles, and at a gauge of 19 sts to 10 cm in stocking stitch before blocking. (It may have stretched a little while drying. I really should measure it properly!) The pattern begins with the centre square, knit from centre out and in the round. I really should have printed an enlarged copy of the chart for myself for this section; I tend to knit in low light in the evenings & found I sometimes had to pick the chart up to decipher it.
For the chart B & C sections (the outer motifs), I cast on extra stitches before knitting the short row sections; roughly centred the cable motif in these stitches & omitted the lace border stitches. I finished the blanket with a garter stitch border.
I owe a massive thank you to Yvonne of Dublin Dye for her support in this project, for taking my sort-of vague but sort-of specific colour requests & turning them into one batch of lovely almost-solid yarn based on Dublin Dye's existing Icicle shade.
My Ravelry Project page here goes into more specific details for the modifications. I hope the notes are thorough enough to be replicated, if wished.
While I was working on this knit, Lucy Hague released another stunning interlocking cable design, already in blanket form! Iona is part of the Illuminated Knits collection. It took all my self-discipline to not get distracted by this thing of beauty.