As good as it looks in the pic it is actually 1 or 2 shades off...

I actually used the correct Star Trek colour code for the blue and had the colour matched for it. The paint for the border of the head box that is.

I am not fussed at all as its close and the quality is superb ! 

But as Wotto mentioned and as i am sure you have done this yourself Nino, MANY MANY MANY trial and error colour matching prints on the same material/vinyl you choose to print on,until your satisfied, and even then it depends where you get it printed from....

IMHO i think it would be almost impossible to colour match spot on for any machine if you were to go the route of decals....A small price to pay for the final product i reckon....