Here's the pattern I modified as promised. Please refer to the YouTube video for the step by step instructions for this mask.
***THIS MASK IS NOT A CDC APPROVED FILTER FOR COVID-19. This mask IS better than nothing and what I'll be wearing at work. I am still working on what the actual filter for this mask will be.
View the tutorial on YouTube here.
I am still trying to work on a PDF upload. Here is a JPEG for now. Click on the picture for a full sized view that you can print. This is scanned as 8.5x11".
Here's the YouTube video I created the pattern from. I modified the overall design from this base design.