No, building a ventilator is like building an engine because you need to go to the store - you're missing so much of the solution to the problem. I've also posted before [1] on why they are a terrible idea to waste time on "designing".
That said, ventilators I believe are already a solved problem for COVID. We have tens of thousands in the strategic stockpile, and production capacity is being ramped up hopefully to meet demand. This is exactly how these stockpiles were intended to work.
