Here's a privately commissioned concept model of a Maserati Quattroporte-based shooting brake. The builders hope that a limited series of such cars will be made.
Personally, I don't like it that much. I mean, it's a great idea - the Quattroporte has been just asking for such a conversion. But the wagon part looks to me too much like a cheap fix-on. The C-pillar is too big and awkwardly shaped, and the rear window looks too low, when comapared to the side windows. Nice try nonetheless