For the primordial voidforge, I suggest that instead of requiring a nuclear reactor, even if it makes 10 voidforges, to use the same materials as the reactor, but scaled down to the power consumption of the voidforge.
A nuclear reactor consume 40 MW while a voidforge consumes 2.5 MW, or 16x less power.
The nuclear reactor needs 500 Copper, Steel, Red Circuits, and Concrete.
Scaling it down (500/16) gives us ~31.25 of each material, which we could round up to 32.
I don't know about you, but that seems a lot more reasonable to me.
Or, y'know, just cut out the reactor entirely. The Exalted Voidwork only need 10 Orichalum plates and a Greater Voidwork. Even without the nuclear reactor it looks cheaper than the Primordial Voidforge.