It's good enough in Maine. The concerns are sheet metal hazards (ripping skin off pedestrians) and carbon monoxide intrusion.
You should make sure your pinch welds are still good enough to support the lift pads. If they aren't, well, your car isn't as safe in day-to-day driving either. As a matter of practicality, you should plug those holes regardless of inspection so you don't get salt water up into the inner rockers, which are structural.
After you Pop_Rivet everything slather it in bondo then paint it with bedliner or undercoating-- you'll never see the rivet heads.
Anecdotally, driving around Upstate NY, your standards are looser than mine. Why not find the manual online and look it up for yourself?