My 03 ZX3 was very similar. Mine came with no power options, and I swapped mine to power everything in one shot. Got my harness, locks, handles, regulators everything from an 03 svt. Everything ends up being plug and play. They have two different wiring harness' that run from the junction box back (to the tails, across the car under the seats, etc.) One has wiring for every option, and one has wiring for none. The harness that goes under the dash itself is the same in all the cars, regardless of the options. So its should just be a simple as switching the harness, and plugging in your accessory options.
Current: 2013 Focus ST II.
Past: 06 Explorer
Past: 03 Focus ZX3 Modded: Rims, SVT Bolt-Ons, Tons of audio stuff with Kenwood Headunit, MB Quart Components, and Subthump Stealth Hatch Enclosure and Amp Rack Loaded with Kicker Goodies!