headache rack?

how would i attach this to my truck?
I imagine I could place those little hooks that people screw into the sides of their bed and then tie-wire it to the headache rack - gheeeetttttoooo, haha
BUT I recall hearing if you drill screws into your cab, they will leak
It would be awesome if I could have it be easily removeable so i could loose 50lbs if im doing a week of commuting or a long roadtrip
hmmmm....

Id also like to saw it off 6inches. to a height below the height of the cab. then weld back on a flatbar up there
I figure that those six inches sticking out probably add a lot of wind resistance, loss in fuel economy