My cat has one lifting central rudder attached to the cockpit's rear bulkhead. I am currently contemplating changing this to a two rudder design where the rudders would be in the corners aft of the cockpit and next to the hulls so in the open. I cannot go the conventional route of having the rudders under the hulls nor can I attach them to the aft of the hulls.

Some time back on a thread here there was a picture of a (Australian?) cat with this kind of rudder set-up which I have in mind. I have searched but cannot come up with this picture and was hoping for someone with a better memory than me to help out!