[Guest]

simmerspaintshop - as you mentioned, is a good source for markings. there are others, like this: http://www.cbrnp.com/decals/index.html - which has markings and profiles.
as for finding out where the markings go on the skin - well, that's where you have to do a bit of work.
load up a skin that has markings, and compare the blank one with it. you'll soon figure out where the markings should go. :wink:
good luck! 8)