The posted calculation of 505 kgs payload didn't take into account the 110 reserve fuel or the 10%. Someone already posted this but was rudely discounted. Also 20kgs of deck time only allows for one landing when they regularly have more than that. With 8 pax possible shuttling they will need two shuttles which is more like 100kgs deck fuel.
In any case, Bond do a good job of making the numbers look better. The gas company is in for a bit of a shock.
Also heard the aircraft hasn't been approved yet for the operation, but again is only rumor.