There's a rather amusing tale of a church not too many miles away from me. After it was built in the 1960s to serve a new housing estate, the powers that be realized that the architect had forgotten to make allowance for an organ chamber. This, unfortunately, was only discovered after the church had been built!
So, part of the brand new church was demolished in order that an organ could be installed.
A couple of years back the church building was closed for a couple of months in order for it to be reordered. The church was divided into two by a solid wall. One half of it was to be kept for worship, the other half to serve as a new community hall. It was only after the wall was built, dividing the building in two, that some bright spark realized that the organ had been overlooked and had been left in the community hall part, and that there was no room for it in the part set aside for worship!
I understand that they're still having to sing unaccompanied......!