Detroit downtown circuit (WIP thread)

[checkpoint10]

Just thought I'd start this planning thread for Detroit. I don't have time to actually work on it right now, but it might be useful to do some planning/discussion since it will probably be a huge project with lots of decisions to be made.

The first question I have is - which year should the trackside objects and adverts be based on? I am thinking 1991 because it is the most recent one and there is a video of it from the official IndyCar YouTube: https://www.youtube.com/watch?v=NZgCf_yIscc