I'll check on the chromalusions to see if something will do the trick. Maybe black allover with a burst of clear with titanum covered mica flakes.
Our silverplater retired earlier this year and we haven't found a replacement. The nickel plating is very close in color to silver (not as cold a chrome) and it doesn't require polishing. The gunmetal (blackened brass) is quite durable nickel oxide.
Black strings - we've got some tapewound LaBellas in stock. These should get the dark tone you're looking for. There's got to be some others out there.
Either a solid mahog body or maybe capped with vermilion like the Stealth bass.
If it's a 4-string, I'd go with 32 scale. As a fiver, you might find a 34 or 35 customer sooner.
Neptune glyph inlay in silver - could look cool on the peghead, below the tailpiece, or across the 11-13 fret positions. Is the fingerboard to be otherwise blank? Should it have blue LEDs?
Neat idea, though I must warn you that if history is correct, black basses take the longest to sell, so if you get one, make sure it's one you won't mind enjoying for a while. But I suspect your nightbass idea may have more appeal than a black Distillate in 1988.
