Nice diagram! Well for me, standing meditation has become my primary practice since I learned the tree posture from Iron Shirt I book. I could write book on the benefits. Before doing this version I tried Zhang Zhuang as thought by Lam Kam Chuen in his instructional videos, but it didn’t work so good for me.
So yeah, I will give this one a try. I see that there is work with the psoas muscle and this muscle is also addressed in the Tao Yin of HT, but I haven’t tried it.