So 1650kg MAUM, minus 5 x 90 kg adults is 1200kg minus say 200 kg fuel is 1000kg - how much of that wonderful luggage space will be available to be filled? Or is the airframe made from pixie dust?
R66 empty weight = 585 kg
EC120 empty weight = 895 kg
SA341 empty weight = 917 kg
so the math could work if you can do EC120 weight or better