There are several ways you can attach the mounting plates to your Z hood. If you utilize the hardware I supply, this is the way I do it. It's not necessarily "the best way," just "one way." Feel free to modify steps as you see fit.
These doors were designed to reduce weight compared to the stock doors. They are available in two configurations: 1) with a full inner fiberglass panel having integral arm rests, and 2) with a perimeter frame designed to allow the door to be left hollow.