While our L650 Fly was being built (we have hull #9), they were also building, I believe hull #10, which had a much larger hard top extending Fore and aft. They did this according to the owner's request to accomodate full enclosure. This boat also got a fairly large HVAC unit for climate control within this enclosure. I have no idea what thus does to the CE rating, or if that mattered to the owner. I also don't know if my 13' RIB on the swim platform changes this rating, but I don't really care that much. It is clear that the hull can handle much more than the crew. Kind of like my 58 with CRM MAN's. The MAN mechanic told me that the engines were designed to be able to continue to run while inverted. Good to know but glad I never got to test them.