The Twinny is not a retro fish.  It is an extremely fast and loose performace board.
Outline: Wider overall template with inreased nose area for paddle power.  It has a wing behind the front fins for drie and bite.
Rocker: Moderate rocker for smooth flowing arcs.
Bottom: It has a single to double concave with V off the tail for speed and control.
Rails: Low/medium rails for sensitivity and just the right amount of bite and hold.
Tail options: Wing Swallow
Fin options: Twin, Twin plus trailer or Twad (twin plus rear quad runners).
Optimum wave size: 1-6' faces.
Novice to Advanced ability.