Hi
Havn't come across a Louis GUISEPPE Butti, but the Queen St. adress was that of James Alexander Butti. I don't know when James's father Loius Joseph Butti came to Scotland, but in 1824, a company called ZENONE & BUTTI, carvers and gilders was dissolved. This company was owned by John Zenone & Loius Butti.
In March 1861, James Alexander Butti, carver & Gilder of Queen St. was charged with "Exhibiting indecent stereoscopic views for sale". James was eventually dismissed with an admonation.
In Jan 1884, there was an explosion in the shop of James Butti at 7 Queen st. James's son Louis liked to go shooting and was filling his own catridges, when the explosion occured. He was injured and taken to the Royal Infirmary. These articles are out of the Scotsman.
It's nice to know that there is a stone and next time I'm in Edinburgh I will go and see it.
Fiona