Build it quite small so you don't have to spent too much time placing blocks! How about 3-5 blocks as the height from floor to ceiling?
[Creative world] Small to medium builds - Including Map Download with Teleportation Minigames
[Survival World] Flower Valley
[Hardcore Survival] Journal - With 3 additional limiting rules
Taking on Dwarfdude194's [Challenge] The Mercenary
Taking on CreativeBuilder56's [Creative challenge!]
Build a house completely dedicated to mathematical studies. It should have perhaps a little garden for good food for the students, a room for sleeping, a room for studying and a room for discussions