First, Quasimodo, I must comment on the material - skulls in a pandemic?? You have a twisted sense of humor!
Second, thanks for all the useful information and detailed instructions and photos. IF I sewed, I would definitely whip up a mask. As my mother learned when she tried to teach me how to sew when I was 16, I am not cut out for it - pun, intended.
You, my friend, are a interesting person - a true Renaissance man!