A Scottish welcome from Southern California. There are many variation to this pattern. The original design is by a company called Poorhouse Quilt Design. They have recently posted this u-tube video to help you thru with the paid instructions:
https://www.youtube.com/watch?v=kWMWEdTPM84
Here is a knock off on the design above. There are slight differences:
https://www.youtube.com/watch?v=SzGiC6SzelMGood Luck
Good Luck!