My question is, would it be worth looking into a bath liner and keeping the existing original cast iron tub or replace it with a cheaper option such as steel or fiberglass?

You should also be aware, if this is a tub/shower combo, that the most common method of insulating a steel tub to make it behave more like cast iron is wrapping it in unfaced fiberglass insulation before installation.

Please just put up concrete board and tile or a fiberglass surround (it is cheap stuff!).

We put a wall between the two bathrooms so they were each separate and removed the fiberglass shower and tiled the master shower.

Should I go middle of the road with the fiberglass modular walls that interlock and screw to the studs?

We replaced all of the fiberglass insulation then let the remediation company do their work. 

If it has a drop ceiling you can put rolled insulation stuffed up in the ceiling packed over the tiles and use the heavy grade tile that’s like drywall not the fiberglass cheap tiles

Hi guys, I lost my login info to my old account, so here it goes:Im looking to close on my first deal, theres a big crack in the fiberglass shower floor right by the drain.

Homes with tile showers, granite countertops, and hardwood flooring will often sell for more than those with fiberglass showers, laminate countertops, and basic carpet. 

The best option would be is the repipe them inside the wall surrounded by the fiberglass insulation.