Say you wanted to outfit an ATR 42-600 for executive transportation like a smaller version of an Airbus ACJ 220. For example, 2 living areas of 4 rows, 1 sleeping area of 3 rows (a double below and a single above on both sides), and increase galley and lavatory by 1 row.
In commercial layout the maxpax range is 720nm. Could the the above executive config get close to 2000nm range? Looking at the King Air 360er range of 2500nm for such a small plane I'm thinking it could be possible. Less weight. Maybe convert some baggage area to fuel tanks. Possible?
Also, I know there is at least one VIP variant out there but it only converts about half of the cabin and leaves the other with economy seating. I imagine that would be heavier than the above.