That makes a lotta sense, y'know. Thing is, you added too many details that were 100% made up by you.
Now, I'm NOT saying that my throey is true, but my belief is that they were born in mthe mushroom kingdom, sent to earth because of some sort of disaster (probably koopa war) and ended up in Italy. Later on in their life they moved to America, became demolotionists (mario's wrecking somethingorother) then construction workers, then it all happens.
If youre interested in conlanging (reating languages), go to
http://www.4gigs.com/~conlang/yabb/YaBB.cgi a conlanging forum.