Reading it so far I learned about the Taima Mandala, which is also explained here.
I haven't been reading so much lately because I've been judging myself to need to put the teachings into action, not read more. But reading the Dharma keeps it in my mind, and I appreciate that, even if it's secondary to being kind or meditating.
I'm going to be falling asleep to Ratnaguna reading pure land sutras.
Also he references an article, by Aaron Hughes called Imaging The Devine.