That does look interesting!
I'm going to try for online permits, and a night drop-off. If I can't get it then, then I'm going to do my best to day hike Mt. Sill and bring bivy equipment.
I want to start EARLY Saturday. Head for Sill, drop my bivy stuff at Sam Mack Meadow and bivy on the descent, only if necessary.
If I can land the permits, I will definitely bivy.
Let's see how many more times I can use "bivy" in a single post.
Good luck SB!