Its pretty common nowadays. I started in 1998. Here are some that I have built. Some are trophy winners at various Hotwheels custom shows. The Shoebox Ford has had the hood filled in and I grafted in two humps from two import tuner cars. Stuffed two turbos in, tubbed it, lowered it, airbrushed the nail polish on, sprayed on automotive clear. The van won 1st place at Hotwheels website in a FORD contest. Its chopped, dropped, tubbed, and lots of misc parts from other 1/64 vehicles.