I don't know of a pdf of the instructions, but check out this vid. Might have the answers to your questions:
http://www.youtube.com/watch?v=kJHiTytj08I
As for painting, you can paint your stuff anyway you'd like. You can come up with your own fluff for a Craftworld that is very similar to Iyanden. You can say it's Iyanden, and maybe just say it's a splinter group that took up the color 'orange' in mourning of their fallen brothers.
Really, whatever justification you come up will be fine. Nowhere in
40k does painting restrict you on the rules you use.