Nice! That’s exactly how I did it, even down to the tool from Harbor Freight. Here’s how my came out:Hey AV, I used rib nuts from Amazon and socket head cap screws both are below.
I went to Harbor Freight and got a rib nut tool, aligned the assembled roof rack, taped it down and marked where the holes should be. drilling and installation was pretty much straight forward, get the right size metal drill bit as close as the rib nut, you want the rib nut to barely fit in the hole you drilled, then use RTV for waterproofing.