Bench seat was great for dating back in the day. That rust in the floors looks pretty superficial. Get the seats, carpet & underlayment out as soon as possible. Take a wire brush to it to determine if there are any holes which go all. If not, clean the loose rust, vacuum out, and coat the floor with Rustoleum rusty metal primer. Brush it on thick. Few will ever see it. Pin holes can be filled with a mig welder if surrounding metal is decent. Spot patching may be an option. Patch panels would be a last resort. Either way get the above out and take action to stop or slow the rust asap. Looks like the old girl has some nice features and options.
I lived in Houma for about a year after Katrina. I had a barber that was so Cajun I only understood every 3rd word. For some reason, he didn't care for Texans, but we got along well. I didn't have the heart to tell him I was one. I rented the brick house next to the historic Henley house. I believe the Guidry's lived there. Doesn't narrow it down much though in that area. Lol.