Peter, I have a nice wooden shed but it's got a ruddy great concrete obstruction in it, otherwise it would make a printer box with 2m cube capacity. And the roof slides back so that the prints could be craned out! OTOH I agree with your comment "Just cos you can isn’t a good enough reason to do something. ". Though if pioneers of the past took this attitude...
Neil, I have considered using the smallest bedroom as a whole room printer but also thought of getting the prints out of the door. In fact the problem with any huge indoor printer would be getting the prints out of the doorway. There is the big shed though - previously used for cattle by the previous owner but currently full of clutter. I have considered this.
Then again, is there anything I would like to print that is bigger than the capacity of my Giant printer? And no, I can't think of anything!