Abstract: A shower or tub assembly comprising a shower base or bathtub having a floor comprising an upper surface and a lower surface; and a support structure coupled to the floor lower surface, wherein when the shower or tub is in use, the floor upper surface is exposed and configured for a person to sit or stand on, and the lower surface is at least partially concealed, the support structure comprises a plurality of ribs, the ribs being substantially perpendicular to the floor, and the plurality of ribs at least partially form a repeating hexagonal pattern or at least partially form a repeating triangular pattern.

Abstract: A method of modular design suitable for use, for example, in a CAD program is provided. In one aspect, the method is embodied in a CAD program specifically configured to support modular design, or more specifically, concurrent and consistent design of multiple installation assemblies of a product. Each installation assembly consists of a reference assembly and a Bill-of-Material (BOM) assembly. The BOM assembly contains component models that are the modular elements to be designed. The reference assembly contains referenced assemblies that are installed to make up the design environment for the component models in the BOM assembly. The BOM assembly in one installation assembly can be reused as a referenced assembly in the reference assembly of another installation assembly. Any changes made to the BOM assembly are automatically reflected in the reference assembly that contains the same BOM assembly as a referenced assembly.