http://www.cehd.umn.edu/nceo/OnlinePubs/AccommodationsManual.pdf http://www2.ed.gov/about/offices/list/ocr/letters/colleague-20071226.html (acceleration)
http://www2.ed.gov/about/offices/list/ocr/docs/hq5269.html (hidden disabilities)
The first one is the manual for accommodations and should give you a good idea of how to write the 504.
The second one is about acceleration (in case they tell you that your child can't have acceleration and a 504)
And the third is about disabilities (in case they push for the disabilities not having an obvious impact)
We wrote our 504, but if you have an IEP, I believe you can just add the nondiscrimination 504 accommodations to it. I don't think in general there is a separate document.
