It looks like a feathered LeMoyne star variation. <G>
It is based on eight 45° diamonds. Each of the diamonds is sort of a "Half Log Cabin" style.
Start with the small diamond for the center. Add strips to only 2 sides. Final strips would be the HST feathers.
Sizing would need to be calculated, could do it with graph paper or with one of the EQ versions.
Great project. Love the finished look.
Pati, in Phx