Well, in 1860 they didnt have bathrooms! the bathrooms were not really the problem, it was HVAC ducts, low pressure in those days with very large sheet metal boxes to deliver air. Now they have high pressure HVAC and you can deliver high pressure air in 2" pvc pipe to registers, wishes they had it back in the day. The real problem was WAY TO MANY historic people in the mix, i give credit to the National Trust, they tried to keep all those people in the sand box but there were just to many of them.