Sweeet. Very nice job - looks way stronger than many of the aftermarket safari racks I've seen.

What kinda floor you thinking of? I'm sure you know to not make it too 'solid/filled-in' or you'll end up with lots of air/wind-loading (think a wing) on your roof...

I've looked through the Rodeo manuals I've got, and couldn't find anything about the OEM rack mounts. I'm assuming it isn't just mounted to the roof sheet metal, but to some kind of structural elements with greater load carrying/distribution structure than that. My guess is if you can tap into the OEM mounting points/structure that's likely going to be better than drilling your own mount points. Good luck!