Dimensions: Once you have a template it can be used again with different materials. LINK.
Materials: Household items that can be used. Tea-towels, cotton T-shirts, antibacterial pillow cases, and vacuum bags. Consider breath-ability vs. comfort. This LINK has more information.
Fixtures: Elastics, ties, elastic bands. Plus possible seals: sports tape, sticky tape. Think comfort.
If you know somebody with a sewing machine and materials who may have a lot of time on their hands, inform them. WE NEED YOU!
helpful links
https://www.forbes.com/sites/tjmccue/2020/03/20/calling-all-people-who-sew-and-make-you-can-help-solve-2020-n95-type-mask-shortage/
https://freesewing.org/blog/facemask-frenzy/
https://hackaday.com/2020/03/18/homemade-masks-in-a-time-of-shortage/
Some music to listen to 24/7 while sewing.
Love, Steve
https://www.forbes.com/sites/tjmccue/2020/03/20/calling-all-people-who-sew-and-make-you-can-help-solve-2020-n95-type-mask-shortage/
https://freesewing.org/blog/facemask-frenzy/
https://hackaday.com/2020/03/18/homemade-masks-in-a-time-of-shortage/
Some music to listen to 24/7 while sewing.
Love, Steve