1. The overal shape is a Voss surface, a surface that can be covered with a geodesic network forming planar quads. It is generated from its Gauss map based on two guiding curves.
2. The structural layout has been chosen dual to this network in order to follow (as close as possible) a Chebyshev network. Chebyshev network has the wellknown property to allow for prefabrication of the grid on the ground and forming of the shape by elastic deformation of the members and shearing of the grid. This property is at the heart of previous experimentations on elastic gridshells (Solidays, Créteil, etc).
3. Chebyshev network do however not follow geodesic lines. The global grid was thus decomposed into independant grid patches (3mx3m) which were then optimised locally in order to get the closest geodesics.
4. The arrangement of the patches follow a nexorade like arrangement in order to insure bending continuity of the grid despite single bolt connexion between members and patches.
5. Finally, the bracing of the grid is added following one direction of the Voss network to figurate the property of the envelop.

1. Ground supports are pinned in one direction with stringers following geodesics on the three surfaces.
2. The free edge is stiffened by a Vierendel beam which is fixed by two hinges at each end. It works hence as a three times hyperstatic beam when loaded out of plane and as a one time hyperstatic arch when loaded in its plane.
3. Façades are set, supported on the Vierendeel and the stringers.
4. The patched geodesic grid is fixed on the Vierendeel and the stringers. Connections between grid members and with the supporting system are hinges made of single bolts.
5. The geodesic grid is braced using continuous laths based on the Voss network. Hinged connections are added at each intersection with the grid using spacer when necessary. This third direction of laths blocks the mechanisms of the quasi Chebyshev patchs and gives the grid a shell like behaviour. The bracing multiplies the buckling load by 15.