I did the molex thing for a while and ended up pulling everything out and rewiring it. Molex is great if you think you’re ever going to port the machine somewhere else, or disassemble it reasonably often. But if you plan on building the machine and leaving it there permanently, I’d recommend as straight a wiring path as possible with as few junctions, terminals, connectors and deviations as you can get away with. Each one is a potential failure point and can have you chasing electrical gremlins for days and having weird carving failures.