My first Zed was exactly 20 years ago. I still have it. At the time I didn't know I would end up with a zed. I just knew I wanted a straight six sports car. So it wasn't a long wait it just popped up and fitted my requirements.
While I agree Dave is technically correct finding pre-done Zed will save time and money, its not for everyone. For some its not so much about driving a completed car as driving a car they completed. That satisfaction is worth a lot to some people.