This article shows the design of single shell hypars.
This is design which is based on a small cabin made for Seth Peterson by Frank Lloyd Wright.
Made of two single hypar shell side by side. As independent shells they do not share supports and need proper support for the lowest corner. Thinking that a cistern made of stone would provide needed protection from the outward thrust generated. And provide a place to collect rain water. Hypar shells are made of latex cement and non-toxic.
when made correctly these roofs will not leak, HyPar design will funnel water to sloped lowest point.
View from the kitchen, playing with colored stone and more inside lights.