Quick breakdown of recent client work (description has more details)

Some recent shots of a job a did for a client. The client provided me with CAD files, but I also had to model quite a lot of it. I used Arnold (C4DtoA), and while the final shots and animation turned out good, the render time was ridiculously long.
I wanted to render the DoF, but was not able to, as render times would have been longer, so I rendered a depth pass. Unfortunately, I was encountering weird fringing and the DoF still did not look right, but used it anyway.
The first shot in this video took 10 hours, 48 minutes to render on my 88-thread machine. Yes, you read that right. Over 10 hours to render one 1080p frame.