Guidance needed desperately! ...anyone had to redo the bath enclosure of their 1950's bungaloo lately? it appears the wall is breaking down behind the enclosure...I am overwhelmed with the task of learning about pricing of enclosures..OR do I tile...sizes of enclosures and quality??? cement board and vapor cloth...Or waterproofing membrane..this is like greek to me..I want to make sure I get this done correctly the first time with no residual problems. any suggestions where to start?? Help..