Turns out bringing the wires across the driver side isn't that bad and there's just a ton of room back there. I installed the extra tweeter wire on the drivers side door tonight from the trunk and I had to take apart the driver footwell area to pass the wire through. Fairly straightforward. Once I had it opened up I could see how easy it should be to pass technics harness through there. At least I hope! I'll find out when the harness arrives but for now that's the plan. I'll keep y'all posted with pics.