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Riv-nuts should be fine. Important part is they are far apart to give strong double-shear mounting for bolt. Can even braze them on with MAPP torche if you've got one.
On back-sides, you can even just braze/weld on those nuts that are already there. Perhaps re-inforce hole with some fender-washers, then thin nut on top.
On such thin metal, I'd be more comfortable with lower-temps of brass brazing than high-heat from welding. HAZ and carbide particles from welding will cause joint to crack over time. Kinda like how those K&N filters blow up over time from metal fatigue.
Heck, might even be able to glue them in with strong 10K-psi marine epoxy!
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