Ventilator Prototypes-I NEED YOUR HELP NOW

I'm working on these 3 designs with NEMA 17 stepper motors to create a last resort option for patients that would otherwise die without access to ventillators. I would appreciate any help from all the experts in design. I am an anesthesiologist with no expertise in coding or electronics; I am using a CR10 MAX printer on PLA. I made a prototype from wood (temporarily broke my printer) and you can see it in action here:
https://www.youtube.com/watch?v=SI2yv-K0nfQ
Please know that we are only weeks away from having to decide which patient whom would otherwise survive to let die.

* There is significant use of other's designs incorporated into these models. I want to apologize for not giving credit to the original creators at this time. I will credit them appropriately as soon as I can.

* I need your help with making sure these designs can survive continuous use for at least 2 weeks. I have never designed anything that needed real understanding of force vectors or any structural com