I dunno- I personally think that it would be have a good idea to describe the Sheik neutral in the guide. While PM is constantly developing, Sheik is a more-or-less established character thanks to her Melee development. She has a few neat new tricks, but nothing particularly revolutionary.
I think it's a good idea to create a threat map to get a general idea of Sheik's neutral option select. When's a good time to just needle on the ground? What space do aerial needles threaten? Something along the lines of Sethlon's Roy guide, which clearly highlights Roy's yes-meh-nope zones.
BTW, I'd like to thank you for your effort in this guide! I realize that the above can sound fairly selfish, considering you're doing this out of the kindness of your heart, but I think that a basic threatzone analysis will help the guide immensely. \0/
Let me know if you need any help!