Thanks folks -much appreciated

With it having been derelict for hundreds of years there won’t be any fancy plaster or other surface decoration surviving - I’m thinking vines.
So maybe just a few floor remnants in the corners?
It has vaulted ceilings which without counter pressure will have collapsed so I’m not so keen on corner remnants that would have to be big enough to accommodate a 25mm dia base. Also, even for remnants I’d have to add extra height to some corners, which I’m reluctant to as it would reduce access to some parts (1/1 hands etc). Thanks for the suggestions though.
