Just found this software, haven't tried it in earnest yet but its free. Like CAD for architects etc, drag and drop guitar components into a S Duncan type wiring diagram petite items to wear of the formal occasions
(Free) software for drawing guitar wiring diagrams, circuit layouts...
Just wanted to present my (totally free and open source) software for drawing various DIY projects. It's originally designed to draw pedal layouts, but...tdpri.com