BTW, the skulls on the XX4 was an illustration scanned, converted to vector art and then cut out on a vinyl plotter out of Avery mask material (like the window masks you get with bodies). I simply plopped it down, fogged some candy red in front of it and backed it with bright Parma acrylic red. Stupid simple.
I'm saving my current paint scheme on the 4wheeler for my X5 conversion.
