Here is more detail on the Consew Industrial sewing machine @matthshooter & family donated:
Consew CN2053R
Single Needle, Drop Feed, Zig-Zag, Lockstitch Machine
Excellent overview of machine by Sewing Insight
https://www.sewinginsight.com/other-brands/consew-cn-2053-r-1-review/
Video of threading and usage by Kris Anderson and Matt Hawes
https://www.youtube.com/watch?v=AyRo_XwNvLw&feature=youtu.be
Manual
https://dallasmakerspace.org/wiki/File:Consew_CN2053R_Manual.pdf
All this is on the wiki in the Tools page:
https://dallasmakerspace.org/wiki/Tools#Sewing
Thank you @matthshooter, @Kriskat30, and @John_Marlow for gathering this and sharing.