This is my idea for a back/roof rack I'm going to make out of 25mm box section. The reason I'm using 25mm box section?
I have a heap of it lying about begging to be used.

Note: Updated to a Version 2.0 further on in the thread.

It's been designed to fit the standard mounts on the back of the Brumby and replace the two uprights that come with it.
The bottom bar is for the Tonneau cover to mount onto, and the top bar is so the boats can rest on that.
I plan to make a special, removable mount to suit the bar that will cradle the kayak, and for transport the kayak will be tied at each end to the back and front of the ute.
The plan is to get it coated by RhinoLiner when I get the door panels/inner-handles, center console, tray and possibly the panel that the stereo mounts onto covered too.
As usual, critiques, commentary, and suggestions welcome.
Anyone else made some on here? I've seen some here and there on the interwebs before.