The KittyKat 12 footer had a solid deck as did the Yvonne.. Yvonnes still have fleets not sure about the kitty. So that are "tunnel" hulls not cats.. *chuckles*

Those foils on Orion look like "Bieker" foils.. Too small to see the profile.. If they are asymmetrical and Beiker style. Their purpose is to extend the aft wave to behind the boat.. Thus tricking the water into "thinking" the hull length is longer than it is.
Theory is "Longer wave = longer hull = faster boat"