He connected trigrams to the TOL, there is a diagram printed in the Book of Thoth (it's at the end of book in the translated edition I have).
Here it is, I found it on the net
His various notes and remarks are collated into a book on Yi Ching. Check Amazon for it. (I never bought it because I have most of the stuff in originals. You can see some of his treatments of individual hexagrams scattered through the Court section of The Book of Thoth.)