This is a fantastic document. There is a lot of great information in here, with links back to the proper books when possible. There are some great quick build tables and some fun stuff cover oddities and powerful magics. Its lacking a contents page, which make it clunky to find things onthe fly, but thats a minor issue for how great the rest of the book is.

I would suggest adding a table of contents for easier navigation and quick find book marks for the PDF i also think you could easily charge for this instead of PWYW. This is easily worth the 5$ of your suggested price.