The pattern I used to make my DD's quilt had similar angles. As per the instructions, I sewed strip sets together and then cut the blocks using a 60 degree ruler. As with the pattern you are trying to replicate, there were two mirror image angles that I had to be mindful of. Also, because one ends up with bias edges, great care must be taken with handling the long strips sets so that they do not stretch.
Look at the far left vertical strip. Forget about the angle and just look at the colours. You can see that it would be easy enough to sew the strips together (to save fabric, offset each strip) then use the 45 degree line on your ruler to cut them.
Last edited by GingerK; 07-27-2023 at 09:28 AM.