Well I am looking to remodel my bathroom cica 1940's and back then they had windows in the shower. Is a Fiberglas Window a good choice for replacing the one that is there now? What is a good brand?

Looking to replace the tub as well as the tile all at one time but cannot afford a contractor to do it limited budget but want to find quality products that will last.

Any recommendations trying to get the items together to get started.