Daniel,
How are you drawing them, in vector or bmp (jpeg) format? They really need to be in vector if you want to be able to scale them and not loose any detail. I will send you the UPS Global logo once I get it done. I don't think either Kadee or Microscale will touch the UPS or Coke logo's due to copyright issues. If you are looking at doing them with an Alps, Jpeg images will not turn out well at all.
I want to figure out a way to use the Alps to lay down a white backing layer, then stick the sheet in an Inkjet to finish the decals. Maintaining registration between the two printers would be next to impossible though.