The content of this grammar seems good and I like it! But I have a pedantic nitpick: Seeing the kana and kanji sections listed under "syntax" is a huge red flag for anyone trained in linguistics. The writing system is not usually considered part of the syntax (or even the grammar) of a language, rather it is just a means to express the spoken language on paper. These should be in an "orthography" section; they are certainly not syntax in the modern linguistics sense of the word. Just some advice to make this impressive work more palatable to linguists :)
I stuck it in syntax mostly for chapter convenience at the time (it's been almost ten years O_O), but splitting it out into its own orthography section sounds fine to me.
