The decals are simply resized, and in some areas, slightly modified version of the Art Asylum pattern that I got off their website. Sorry, I dont have the link and I am having a heck of a time finding them on my computer...but I am searching.
To make the nacellels straight, I did no modifications to the pylons themselves. I did cut off the connecty thingys (that is the technical term) to put the two halves of the "engineering" area together, because I noticed that if you use those, the alignment is even worse. However, after doint that they still were not straight. So what I did was put a tad of glue on to where the nacelles connect to the pylons, line the nacelles up by site, and precariously balanced them using whatever was available to hold them in place, then added more glue. Then when they dried there WERE gaps which I filled in with putty which also helped keep them sturdy onto the plyons after it dried. After sanding and re-painting, it turned out as you see.
I hope that made some sense. I basically just did a hit and miss to see what would work and went from there.
James