Well actually, we have seen all of these photos in the past on the net and at least in one or two books.
I know someone who has played the Dragonetti d'Salo Bass briefly. I also have a book by Stefano Pio with pictures of the d'Salo after its restoration by Scaramelli. My Martini has his restoration label in it from 1999 as well. Hopefully, Scaramelli did a better job on the d'Salo than he did on my Martini internally. The Martini is currently in restoration and we are re-doing much of his 'hurried' work.
On the 'Giant', it has never been referred to as a 'd'Salo, just a big Italian Bass that Dragonetti owned.
One time around 1977 while living and playing/working in New York, I accompanied a fellow Bassist to Philadelphia to an older gentleman's house that had the basement full of Double Basses shopping for an Italian orchestral Bass. I can't recall the mans name but one of the Basses was touching the ceiling. It was a huge Italian Basses over 7 feet tall. The shoulders almost reaching my neck and I am 6ft tall.