Thanks @Helpful Engineering for a lot of this stuff!

EasyEda is an easy way to share PCB layouts. It allows generating Geber and BOM files and ordering their manufacture in JLPCB.

Under normal conditions, the manufacture of PCBs at JLPCB takes 24-48 hours.

I have opened a public project called Ventilator Pandemic, where to share PCB.

PCBs (in addition to electronics) can be used as mechanicals or structural component.