SignWriting enables the writing of sign languages, all sign languages. The only way to learn if it is for real or just an academic exercise is .. do people write and do people read.
The bible has always been one of the first books that is translated in a language. The gospel according to John is now available both as a book and for reading on the web.
That is the writing part
This video shows Ed, Ed is deaf from birth, he does not know SignWriting in depth but he got interested and studied it a little. He then reads chapter 3, verse 16 from the "gospel according to John" from the book.
Have literature, can read!!