How closely has Mark Herman adapted "little Voice" from Tennesse Williams' "Glass Menagerie"?

Mark Herman’s Little Voice and Tennessee Williams Glass Menagerie are very similar, in many ways yet the two also have their many differences. In both stories, the girl, Laura or LV is searching for freedom, and they live in a one-parent family where the dad either died or ran off a long time ago.

The Glass Menagerie is set in America in the 1940’s-1950’s. The Wingfield family consists of Amanda: Amanda is physically small, full of life, but grasping for another era of gentility or civility that no longer exists, however is also admirable, pitiable and laughable at the same time; Laura is the daughter of Amanda and the brother of tom. She is crippled and walks with a limp and a brace. Laura has retreated into her own fragile world that centers around her collection of glass figurines; Tom is an aspiring poet, and works at the warehouse to support his sister and mother. He can’t take much more of the numbing life he now leads; he plans to make an escape.

The Glass Men...