Converting a Concrete Water tank to accommodation

This may sound silly when everyone wants to have rain water tanks, but I have three very very large ones, and we are doing a start-up project for a rural centre and wanted to use one of the tanks that (we have been told but not tested) has a slight leak so its water storage purpose is not there. We wanted to create an part-time/holiday/camp accommodation out of it, putting a roof on seems easy, but any advice on what we need to do with walls/floors for installation. I know we need to put airbricks/vents in but any advice on installation/internal protection?


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