The image is a quick render of my ideas and should help you picture what I'm asking; the black is the foam's outline, the blue would be the core and the red would be the straps:
1. Is there any advantage to having a curved shield where only the face is curved?
2. How would I curve the face? (Disregard if question one is no)
3. How far off center could I place the straps without compromising my ability to keep it stable?