I was thinking maybe just a little 60mm or 80mm that still pushes enough air to keep me somewhat cool. My plan is to wear my set for Spirit Day at my school next year, and they won't let me keep the helmet on (and they might not even let me wear the armor. ), so I won't be in it for too much at a time.
Oh, and the battle damage on your daughter's chestplate/backpack turned out good, or at least the little I could actually see.