Uber Mechanical Engineer interview questions

I was recruited to become a vehicle mechanical engineer at the ATC in Pittsburgh. The homework assignment was a full blown professional ready to make optical part with FEA, documentation, BOM, etc. I was flown to the area and had to front all the money for the plane, stay and rental. Place seemed awesome, but they had a good cop/bad cop interview thing going on. They loved my response to the homework assignment. I even brought in a prototype part but I was accused of having someone "doing the assignment for me", lol. It took them a week to get back to me. Someone from the interview told me I did not get the job and not the recruiter or HR. They had a seperate room of 10 people looking at all of my stuff on a projector that I never got to meet and it was a bit creepy.