It's done on your original side panel.
Hydrographics or Hydro-Graphics, also known as camo dipping, immersion printing, water transfer printing, water transfer imaging, cubic printing, or hydro dipping, is a method of applying printed designs to three-demensional objects. The hydrographic process can be used on metal, plastic, glass, hard woods, and various other materials. In the process, the substrate to be printed is pre-treated and a base coat material is applied. A polyvinyl alcohol film is gravure-printed with a graphic image to be transferred, and is then floated on the surface of a vat of water. An activator chemical is sprayed on the film to dissolve it into a liquid and activate a bonding agent. The piece is then lowered into the vat, through the floating ink layer, which wraps around and adheres to it. After removing the piece from the water, a top coat is applied to protect the design. With multiple dippings, hydrographics printing can achieve full 360 degree coverage of the part surface, including small crevices. - Wikipedia
In short, lay the film on water and slowly dip the part so the film adheres. After dry, you want to spray a coat of clear paint.
If you have crashers, it would be a really good idea to put some saran wrap or other material on the side panel before it rubs the bar when removing the side panel.
Looks great!
