As a former nationally competitive archer, if you are looking to make an amrguard for go and not for show, think minimalist. All one needs is a very thin strip of leather, possibly stitched with a s,mall rod in the center and held by elastics and velcro. The guard shown would be very uncomfortable, after shootng all day in the hot sun.
If, however, you are looking for a guard to go with your horned Viking helmet, the pattern is perfect!
Cya!
Bob