When I saw all the matoran heads used for shoulders and whatnot I thought this was one of Chris's MOCs, but I was surprised to scroll down and see it was from you. It looks awesome! What you did with the HF 1.0 arm is essentially what I did with Thorin and that wide late-year matoran arm. The head is pretty neat but from this angle it doesn't fully make sense to me.
Oh wow, this is beautiful. Lovely parts usage everywhere and it has such a unique, abstract quality to it. Just one suggestion... you might want to change those mata green hip sockets to another colour, maybe black. They look a tad out-of-place right now.