Warp-Shell
From EM Drive
Described initially here in this NSF post, this design has gone through several changes. The base hexagon cone design has remained the same. Three cones are planned, one solid copper frustum to replicate other designs, one with perforated copper for the walls to allow for thermal venting, and one unknown.
Further information as to the geometry can be found in the following links:
1387199 (old floating design)
1387435 (old floating design)
[18] dimensions