Love it. Looking great so far.
The needles. They will be the pièce de résistance! How about just soft/fine sanding the surfaces of the clear resin casts, so they become frosted. Then you can throw LEDs inside (via a drilled channel). The "frosted" surface should "grab" the light. That's an option. But, it'll compromise on the clear crystal look.
I'm thinking Superman's Fortress of Solitude. You know, his little control panel when he activates it. That could be a reference.
or this: