There is no point dwelling on what has happened; you cannot change it, and it certainly won't make you feel better. Learn from the past and don't make the same mistakes again.

You should regularly visit the guys who are now working on the car; ask them about what they are doing and get them to show you and explain. That way you will understand what is happening, what is going right and what is not. Get involved and keep an eye on it.

If you are unsure about an issue there is mountains of experience and advice available here. Just ask.