The tub doesn't look bad at all to me, but the real answer to your question will be when you pull the tub out and see the condition of the bottom of the cabinet. If the seal around the tub drain failed at all then the condensate would seep into the layer of insulation between the bottom of the tub and the cabinet. That is what would lead to the dreaded beltline rust. If you are going to redo the interior, then you will want to replace the insulation as well. Look up through the compresor compartment and see if there are any rust holes through the bottom of the cabinet. Hopefully you won't find much, but most seem to have some level of rust in that area.
Good to know—I’ll check that.
A few years ago the drain tube clogged with mineral deposits to the point that condensate collected in the pan. I tried to clear it but finally ended up cutting off the gooseneck of the drain and hose clamped rubber tubing to it which leads to a drain pan. Maybe not the best idea but this has remained functional.