With SCAMP the compartments are integral to the strength of its monocoque structure. With the CY you are adding unnecessary weight to an already sound structure. The only known recorded capsize of a CY was when one tripped over its own anchor line in three feet of fast moving water. I shouldn't say that its not possible to capsize one but it is pretty darn difficult. I just think with the CY there's lighter ways to add flotation. Boat fenders have worked well for me. They're multi-use. You can roll the boat on them if necessary, use them for flotation and actually use them as boat fenders occasionally.