Floor doesn't look that bad. The floors on my 55 were much worse, you could see the ground.
Corroseal is a product I use for surface rust. Steel brush and apply, good for the frame etc.
Say Hi to Gary for me.
Welcome, I hope you know it is difficult to just have only 1 Land Cruiser.
You may want to check the clubhouse section:
https://forum.ih8mud.com/forums/pa-keystone-cruisers.77/
Local help, as well as members selling parts.
Hope to see you on the trail.