Matt, have you seen these as a way of doing larger interiors for your games?
http://wargamesbuildings.co.uk/epages/950003459.mobile/en_GB/?ViewAction=View&ObjectID=11450674&PageSize=5&Page=4
http://wargamesbuildings.co.uk/epages/950003459.mobile/en_GB/?ViewAction=View&ObjectID=11450674&PageSize=5&Page=4