The protomatter idea is from the 2nd Edition Planescape book Guide to the Ethereal Plane.
For the purposes of this document I want to keep things as rules-lite as possible, and I'm not very good at making rules whole-cloth, especially when it comes to reality-shaping planar essence.
It's rather easy to manipulate and store, like clay, but more complicated projects require significant expertise.
As for the single document proposal, I really like this idea, but I've never used Google Docs, and I want to be able to upload the product without giving up any personal information of my own (I believe you need a Google account to make a Doc).