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Those wired mirrors are cool - they gently heat the back of the mirror so that it doesn't steam up when shaving

Or just line the walls with treated 12mm ply so wherever you want to put a screw there is a more solid wall - I've done that to bathrooms and kitchens

If you are putting a bath (or a shower tray) in , here's a tip

Once it is all connected up and doesn't leak and before you put the front panel on, fill it with water and spray expanding foam...