I do have a couple of questions related to your build....
At the Model Cars Magazine Forum you said "......... to take an image from the internet and turn it into a decal image that is 600 pixels per inch. you then print it on decal paper......" Are you changing the image to 600 pixels in the Photoshop program or choosing to print 600 pixels with your printer? Reason that I ask is that I use the PhotoScape program where I can dial in pixels per inch where I need them but I can not change any print settings as far as the pixels per inch go on my HP printer....its either 300 or it automatically chooses .....I think???
Also, would I have any luck getting rid of the ridge that the decal has if I was to apply a thin coat of floor polish on it after it has been placed on the body? I faithfully use the Micro Set and Micro Sol solutions on my decals , but still have a tiny ridge, at times, on the decal.