Just woke up to and see your awesome attachment bathroom plans that are much better than the ones i made
Quick note: my wife talked to the owner and the 2 small interior walls of bathroom 3 can not be removed as we had thought. So the size of the tiling area will be cut there. I have to go teach a class for 2 hours but when I return i'll post a more detailed explanation.
For now just don't design anything for bathroom 3 until i update the information for it.
All other bathrooms are still ok.
Here is the updated Bathroom 3 info.
http://postimage.org/image/ixq8ev7cr/Note that the upper portion will not be tiled over and the bottom portion inner wall does not have an exact measurement. The landlord lives very far away and I can't get access to measure or take pictures at the moment.
We have also decided to remove Classroom 1 Bathroom 2 because Bathroom 1 will be large enough to accommodate enough children.
So again, no more bathroom 2, and no more upper portion to bathroom 3.
Edited OP to clarify.