I think every surfboard maker has models. Models that has been refined and tested but once in a while a customer asks for a specific thing to suit their surfing needs. Heres two that was modified to suit a customer's need
This one was originally a Big Chief. I pulled the tail in a bit and lowered the rail apex for added rail maneuverability.
Second was originally a HipPin. About the same template with 50/50 to 60/40 to hard edge on the tail to be used in slightly bigger surf.
This is why we make CUSTOM surfboards.