OK, I have a book on (many world cultures) myths and legends so I am familiar with the story you related, but getting my mind to go from "tree" to "Valhalla" (which goes directly to mead halls) isn't clicking for me.
However, I do appreciate the brain stimulation.
And the graphic is nice. I like B&W. The idea mentioned about making the roots as the branches is good, but I would worry about a
person pouring the beer out (onto themselves) during the turning of the bottle.