I haven't looked in a while - but aren't there kits that make all that pretty easy??? I suppose I could pop over to Crutchfield and take a peak.... But IIRC they even had kits that allowed the "weirdly wired" MACH system amps to be maintained to a degree.....It's an easy job unless you desperately need the steering wheel buttons to work. If you like fords touch system with my link etc, it'd be better to let a dealer handle the integration.
I gutted my 01 and put in 25W of Class A.