Special Edition, among others build bespoke 550's.
There are also some very nice privately constructed 550's as well.
I have a bespoke built Speedster. When people say it's a kit car I simply tell them that in my case it isn't, but there are some that have been purchased as kits. I could care less what people think. I don't show my car, I own it and drive it because I like it.
It doesn't rust, it is faster and better handling then the originals and if I stack it up I haven't destroyed a ridiculously valued automobile.