I had wanted to say the name was "Fellei Miei" or something like that -- keep in mind it's been a couple of decades since I read the article in which it was mentioned and I don't speak Italian anyway -- but when I run "my sons" through an English-Italian translator, it spits out i miei figli and I can't recall if that was the name or not.
Stick "i miei figli" and "outland" into Google and you get a bunch of hits for websites that aren't in English but I don't see anything that seems connected to the movie. I didn't spend a long time looking through them, though.
If my feeble memory serves, I think I read the thing about the shuttle's name in an article in Starlog magazine, but like I said, it would've been around the time the movie came out, which was 1981, according to IMDB. I do recall the article had at least a couple of photos of the construction of the ship, but they are photos that appear on Mr. Bowers' website. I recall there was at least one overall shot showing people working on the model with the top off, then there was the photo of a modelmaker applying glue to one of the landing legs.
I suppose someone could e-mail Mr. Bowers and ask him the name....