The original design has a fair amount of strength thanks to the inner pyrimid. The problem that next needs to be focused on is the inner triangle that folds under the seat. When the user is sitting on the stool there is a chance that the undersides may loose there rigidity. To solve this, the unused triangles will be extended to fix to the outer pyrimid faces. When the user sits on the stool, their weight is exhausted on these triangles which then passes the force onto the Pyrimid.