I needed a rack for a roof top tent on my XJ and wanted something very slim yet tough enough to carry the tent to the Cape as well as suitable for chucking lengths of steel etc up there. I also already have a roof basket I can mount to it if I need to.
Here's what I knocked together today, the perimeter tube is 20NB medium wall which means it'll take a hit as its 2.6mm thick. It's also easier to weld. The cross bars are 50x25 and are 1.6mm thick, I made them wide as the mounts for the tent will be a better fit. To get a good fit I used a 1" hole saw to cut the ends so they wrap around the tube.
Total size is 1900mm long 1275mm wide and 25mm high
Tomorrow I'll weld on the end rails and give it a tidy up in preparation for the gutter mounts. I'll also weld on some light tabs and some hooks for straps etc. I'm expecting it to be lower than the stock roof bars (which will come off)
Total cost so far a touch under $60
Cheers
Steve