Here's an article on an inside look at the Toledo plant where the 2017 Jeep Wrangler is still currently being made (JK). It's actually pretty cool and probably not how you think it comes together. For example, that lower bumper is assembled separately together with the engine, frame, etc. before it gets mated to the upper portion and rest of the body. Then the back half of the top gets put on.
https://www.cars.com/articles/2017-...e-people-behind-the-jeep-plant-1420695900868/
https://www.cars.com/articles/2017-...e-people-behind-the-jeep-plant-1420695900868/
