the shell is not lexan, it´s styrene (or whatever the carrera bodies are made of).
decals are printed on waterslide decal paper using a canon inkjet printer at home. decal paper gets one layer of clear coat to secure the print. works quite well. backdrop is that you need to cut out the decals very carefull, as i cannot print white at home. you can choose between white decal paper or clear decal paper. clear decal paper missing all white spots, if you print the decal. you need an ALPS printer to print white i learned quite some time ago.