Sextantio Rwanda, The Capanne Project, as it styles itself, will consist of a cluster of beehive-like thatched dwellings inspired by the King of the Tutsis’ Hut in the Ethnographic Museum in Butare and built without electric tools. There’s a beach from which one can swim, though it won’t be warm: the lake has depths of 1,000m and an altitude of 1,460m; the year-round average air temperature is 20C.