Class 40 min displacement is 4580 Kilos.
The current 90 deg. righting test numbers are currently 235 Kilos Min. and 323 Kilos Max.
Piro, the small boards at the shrouds are for spray deflection as seen on quite a few class 40's.
The larger " bulwark " style hull sides aft of the shrouds that you are referring to are essentially a raised sheer that does not affect the Righting moment when the boat is at 90 degrees for the...
And Brian Harris is back at Maine Yacht Center watching over the re-fit of the Ex "Bolands Mill" USA 15 Koloa . Seems some progress is happening ! Not having line tunnels we were limited in how much "Canopy" we could build out .