The salvage title was due to a previous owner, many years ago, being advised by a California DMV numnutz that it should be scrapped before being donated to a local charity. The PO tried to reverse it after finding out that the advice was incorrect, but no luck. The supporting paperwork is included with the car. The charity had some minor work done to the car and sold it. Does that answer your question?
The sunroof is a matter of great consternation to a few Alfa fans because there is very little documentation about them. The consensus seems to be that the Alfa dealer network worked with one of the major sunroof companies (Webasto?) to have them installed when they arrived in the US. The fit is very much factory looking, and it works well. The sunroof panel fits perfectly with the profile of the roof, and functions as if it was designed by the factory. There are several around and the construction is consistently high quality. This one is electric. Some are manual. It is a nice addition to have. I believe there were a couple other European cars that had a similar option available to US consumers. There are a few threads on GTV sunroofs here on Alfabb.
The best thing about this car is the value. Clean, rust free and great looking GTV that runs and drives very well for a lot less than a comparable car that doesn't have the word "salvage" in a small box on the pink slip. Some states don't include salvage info on the title, and neither do most European countries. So, if it goes to many different states or oversees, the title would be clear.
The car does have a recently redone cylinder head and valves, as well as an overhauled suspension and new shocks.
Feel free to follow up with other questions.