Thank you for your feedback. I agree with your points; manufacturing is an essential part of the process that I neglected to include in the article. Thank you for bringing it up. When we are at that stage, I would appreciate your feedback and suggestions.
Either you have lots of trial, and error yourself, or you pay somebody for a bit less of it, but still nowhere near a complete assurance.
An experienced contractor may keep burning your money, but deliver something in the end.
If you yourself is not confident in your experience, there is a risk your team just running out of enthusiasm, and patience, if not money without seeing the light in the end of the tunnel.