It is an amazing hilt! I have one as well, same plain black with no engravings or windows. This beauty feels very good in the hands and I really love the tsuba below the emitter section. To me it feels like a natural extension of my hand and I love it. Toying with the idea of sending this one back in for the same type of upgrade. I don't have emerald nor diamond, but feel that diamond is so worth the money. My spectre is Arctic Blue with AS FOC.
I was thinking something along those lines as well. A Spectre emitter and tsuba on a Manticore hilt. The Manticore is very clean, no activation box. Perhaps even switching emitters.