Jason Chandler designed this ‘cartoonish’ aircraft for X-plane and writes “…… This aircraft began its life as a pencil on notepad sketch, of “what would a MIG-21 look like as a single place GA grand touring, sport and race plane. Included here is the scan of the sketch for you to enjoy a piece of how the design was invented in my imagination….”. Available here on simMarket.Another ‘fantasy plane’ is the ‘Seawing’, also from the same author. It apparently flies on an air cushion formed just above the water. See it here.