Shower wall advice sort


I've a very old house (1700ish)that has been mucked about something rotten. An old hall way has been turned into a shower/toilet. But such a bad job was done (of the shower part) that the tiles keep coming off both an old original wall (hair & crumbly type plaster) and a newer plasterboard wall. It looks like the tile adhesive used is not waterproof! Except for the bits I've repaired, which I can't get off with out doing severe damage to either wall.
So I've removed the whole shower - wish I never started :-(
It is such a mess behind everything that I was thinking of using some sort of waterproof board (WBP?) then attaching the tiles to that. (BTW one FAQ says to use PVA another warns not to with waterproof board<?>)
Otherwise I have to get two walls, one old, one new, re-plastered.
An other choice is a ready built shower cabinet but they don't look as pretty. Or that wall-board stuff that is already waterproofed for bathrooms/showers.
Your advice would be much appreciated. Slatts
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