Bottom is open and no need for upper system.
Screened bottom is sentisite to wind blow. Take care of that.
Presumably, you use screened bottoms. Have you found an adequate way to set up wind baffles? I'm thinking that I might just use empty supers with screen stretched across them with a grid of luan or something below the mesh to help break the wind. The only trouble, here, is: would that not just help direct the wind up into the hive?
Must find engineer with access to wind tunnel...