Some numbers.
60:1 at 78 knots (knots, no typo) at max loading.
250 liters of water gives a wing-loading range of 40-58 kg/m2 (8.2-11.9 lbs/ft2)
That's almost a 50% increase in wing-loading from minimum to maximum.

Price? Just give us a hint. More or less than the national debt of
Greece?

John Cochrane