You can make more, or fewer, rows of cables, as you wish.
The original afghan was made using Chunky (Bulky) weight yarn but the instructions explain how to make it in any yarn of your choice.
This is not a conventional knitting pattern. If you can knit garter stitch you can make this. You do not have to be able to follow a normal knitting pattern as the instructions are in simple words. It is suitable for beginners and experienced knitters. You do not have to work to a particular gauge.
Included is a sheet where you can keep track of your own colourways and record your progress.
This is just one of a large collection of afghan designs. Look out for more.