

Knitting pattern adaptation
Im wanting to adapt a Harry Potter themed knitting pattern i have for a jersey/jumper into a baby blanket and I am having a hard time working out how to work out the motif distribution/adoption to the correct size of the baby blanket.
Overall I was wanting to make the baby blanket approx 100x120cm, using 8ply/DK yarn and 4.0mm needles. I wanted to do a garter stich border with the first and last 10 rows, and first + last 5sts.
I dont want to have to do too many repeats of the motifs and make the blanket look too busy but im struggling with the maths.
Is anyone able to help me out or point me in the right direction?
Added photos of the original pattern/motifs
Full pattern/photo Credit to: Harry Potter Knitting Magic by Tanis Gray.
Edit: Tension os 10x10cm when worked 22 stitches across 30 rows on 4mm needles, working flat. With some maths help, working the motifs across 24 stitches,23 rows high, with 12 stitch gap would create 5 repeats distributed across the blanket but im unsure how to scale the motifs within that.