Originally Posted by
KalamaQuilts
I just remembered I've also foundation paper pieced
https://www.generations-quilt-patter...ilt-block.html
and also if you like the technique you could english paper piece them

An easy to get along with technique!
looking at your pattern the block technique shown on the first two links wouldn't work because you are not looking for a block but a series of triangles.
Thanks for your addition comments.
I have done a little EPP but don’t really fancy that for this project.
I think I might just try getting a piece of paper the size of the cushion top and draw out the design.
Even if this just gets me the size of the angles it would be a starting point.