How modified it to add in the cables;
To include the cable panel over 6 sts it will be in the 2nd part of the short row (1st part = first 30 sts of the row, 2nd part 31 to 46 sts and the 3rd part will be 47 to 60 sts). Twisting the cable by placing first 3 sts on a cable needle, k3, then k 3 sts from cable needle. I have chosen to do the cable twist by holding cable needle at front of work, then at back then at front again (so just keep track of repeating front/back/front/back …).
In order to keep pattern correct all cable twists should be done after each 5th garter ridge on RS.