The Runway extension is for enlarged safety zones, not declared distances. I'll have more runoff if I need to stop, but I won't get more weight available for takeoff, or landing. It won't give me more fuel to go further, or more weight to use. The same for a 738 or A319.
"I" not we- Captaincy getting to your head already AFO.
So your telling us that the pontoon being built in to the sea is not weight bearing?