The previous owner of our Cherokee installed the T&J Performance pre-bent cage kit, which did not provide enough head room for pre-running in our 1995 XJ. On several occasions, over the course of two race seasons, passengers hit their heads. It was bad enough that we had our race shop fabricate a custom rolled cage to better meet our needs. Once started, it took approximately 10 days to complete the main structure.
Here's all the video I was able to capture before my iPhone's beta iOS expired untimely, as I was away from my MacBook Pro to upgrade.
http://www.youtube.com/watch?v=GM_Zjgh8GFE&sns=em