1. A method for constructing an integrated circuit to implement custom logic functionality, comprising: constructing diffusion and metal layers to construct a generic array of logic cells and field programmable switches, including a plurality of unconnected field programmable switches and unconnected logic cells; and choosing a netlist corresponding to a particular end-user application to be implemented; and completing the fabrication of said integrated circuit for the specific initial overall functionality of said particular end-user application by implementing in additional metal layers, a final connection layout with custom hard-wired metal connections between some of said unconnected logic cells and also incorporating custom hard-wired metal connections between some of said unconnected logic cells and said unconnected field programmable switches.