A preliminary look at the Optimist rules indicates that they weigh about 45kg ready to sail. 35kg min hull weight (with bouyancy bags), approx 10kg rig???

The F12 is a bigger boat with a similar structural integrity requirement and bigger rig so it should be expected to weigh a bit more. A 50-60kg rigged weight with a corresponding platform weight of about 40-45kg does not seem an unreasonable minimum weight range at this early stage of the class.

Does this match up with Gato's experience?

Optimist Rules