The (black only) design file for a water slide decal in the building documents has been used succesfully many times without any scaling issues ... It was made with Inkscape, but the exported .pdf seems to work fine. The file for UV printing has 3 layers (color, white & gloss) as per Tayda's requirements, and has also been used quite a few times without any hassle. Also, the drill coordinates available from the files section, line up perfectly with the UV.pdf I'm not sure what else I could say, but everything you need is already out there ... (thanks to our members)