I took the car to a diy-shop today, where you can rent lifts by the half-hour. I had three goals:

1. Take pictures and measurements of the various stuff in the car
2. Get an intuition for how things might come together, including mounting
3. See if I could see the exhaust leak

1 and 2 went really well, and I'll be using these pictures and measurements throughout the design process. I could not see the exhaust leak.