Recently I started building a roof rack for my XJ and have it almost finished except for the gutter clamps and paint. My main purpose for the roof rack was to free up some space in the Heep for the camping trips and create the ability to bring more crap along when I take longer camping trips. Today while searching another forum I found a really sweet home brew roof top tent and I think I would like to take the same route this guy went with.

Here is a link to the thread, the pictures start on page 8 and he has a pretty detailed thread going.

you may have to be a member of expedition portal to view the thread, I am not sure.