This idea was originally posted in the 80's Forum.
https://forum.ih8mud.com/80-series-tech/59928-new-how-tech-80-series-aluminum-roof-rack.html
(see the links in the original thread for construction details)
I made one for my 80, liked it so much, made a few tweaks for the 40 and made another one. For the 40, note my lessons learned in post 94 regarding placing the rain gutter towers correctly. For the 40 I would have also probably not painted it black, just left the aluminum bare.
https://forum.ih8mud.com/80-series-tech/59928-new-how-tech-80-series-aluminum-roof-rack.html
(see the links in the original thread for construction details)
I made one for my 80, liked it so much, made a few tweaks for the 40 and made another one. For the 40, note my lessons learned in post 94 regarding placing the rain gutter towers correctly. For the 40 I would have also probably not painted it black, just left the aluminum bare.