Aluminum 2015, F150, repair certification.

I'm not a fan of riveted aluminum structures. Ford has been playing with this idea since the drop top fox bodied mustangs.

Aluminum is tricky. It can be welded, but unless you know the series of aluminum, which calls for a different series aluminum filler metal, with the exception of 5000 series aluminum alloys, you are playing with fire. 7000 series aluminum alloys cannot be welded and hold up under load. A lot of heavy duty truck beds are made from 7000 series aluminum. Most structural parts are made from 6000 series aluminum, most sheet metal is 3003, but if you ever decide to make something from scrap aluminum, don't plan on using it for anything critically structural.