TomCat Dirt Bodies come assembled and precut to fit the Artin chassis.  The nose and main sections are separate pieces.  The front axle and chassis secure the nose in place.  The main section tab slides into the nose, and the sides attach to the chassis with tape or Velcro.  Buy one of these, open the box, and you'll be dirt racing in minutes.  No tools or trimming are required.  These bodies are laminated paper.  To decorate your own, order the plain white one and use decals, markers, paint pens, etc.