I have so enjoyed reading this here. I really like your, fey, slightly other, Legolas. His friendship with Gimli developing throughout the story as important as the tenuous, sweet, relationship with Éomer which 'is what it is'.
The language you use to describe Gimli's relationship with stone, metal, heat, and the forge is wonderful - so different from, yet evocative of, the way the Wood Elves relationship with forests and streams is usually written.
The sense of unease and awe in which Legolas holds the sons of Elrond is interesting, and rings true, I will be interested to see how this plays out in the sequel - somehow 'Sons of Thunder' makes me think of the twins, I wonder if I will be proved correct?