In terms of Chuojiao this has been outlined in the below
http://www.satirio.com/ma/chuojiao/lineage.html
and a smaller treatise on Beijing Chuojiao Fanzi as well below:
http://www.satirio.com/ma/chuojiao/beijing.html
Regarding Jinggangquan/chui, the reason it is called 'jinggang' as commonly known by all of us that practice it in Chuojiao (which are only a few of the older lines) is because it focuses on the 5 hardnesses into one. This principle is to provide structure which is similar to its sister set of Liuhegen. Whilst later sets have different focuses.
Erlangmen is a completely different thing and will appear on the website sometime in early 2009.
But I do not get it, if you had commented does that not mean that you studied them before and would know such things !
Kind Regards,
Wu Chanlong