Well if I understand what they want to do with this, they're talking about completely removing the top and replacing it with CF. I'd think the localized impact would be pretty bad for CF, especially if you get unlucky and hit it dead nuts in the middle of a weave, where strength is lowest. Yield strength numbers are nice for pressure containment and fatigue, but not for impacts.

I may be wrong, however. Haven't really thought it through yet.

Impact Strength will come down to the layers and how they are stacked... typical parts are laid with a 90 degree process where the pattern matches with each layer. While structural parts are laid in a Quasi-Isotropic process which is a diagonal 45 degree pattern:
Ex: of layers...
http://www.dragonplate.com/images/sheets/0-90.pnghttp://www.dragonplate.com/images/sh...-isotropic.png