That is one cool site in the inter-web. I had to stop perusing it after a few short minutes or I would surely find myself deep in the rabbit hole...put it at the top of my list for my next afternoon off!
The Spyder Factory in New Hampshire has used several 550s in developing their reproduction Spyders, but IIRC they had the use of 550-0090 for something like 6 months to laser scan it and thoroughly document every part of it by taking it apart, documenting parts and re-assembling it.
Why that one?
Because it was originally delivered in street trim, never raced or damaged and was still in pristine shape.
That said, since all 550s were custom-built by hand, no two are actually the same (Kind-of like early 356 Pre-A cars). All body panels were beaten into shape on wooden bucks by hand, so you are allowed a little latitude on a lot of the parts to make them fit. Hence, Ed's magnificent job of "aging" his fuel tank (among other parts).
He just re-did that web site a few months ago. Dude's in Australia and spent a lot of time studying and photographing 550-0056 (another blue car). He's a font of info and very much has the detail fever.
On the old site he had about a bazillion shots of the restoration of 0051, which are mostly all gone now, which has caused some link rot on my build thread.