The DIC is easy. 97 only swaps with 97, 98-02 are compatible, 03 only swaps with 03. You may even have the wiring connectors in your car, taped up and hidden.

The dual climate control will require you to gut out your interior all the way to the firewall. I've only heard of 2 people taking the time and effort to do this.

To the mods: Am I allowed to link to all my info over on CGP without breaking any rules?