The NP has FADEC and VEMD which is different from the other models of the 355. It has a 2,5 minute OGE, OEI (take-off power) at about 1500ft in ISA and at about 2200kg's.
An empty basic ship weigh in at about 1500kg's so you'll have something to play around with.... unless they are unusually fat kids. 5pax on board and an hour worth of gas, should leave you with an AUW well under 2000kg.
Now, what is a bit intrieging is the fact that you go after an operator and question this perticular operation, when you have an axe to grind with BG and should direct your attention directly to him instead.