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Thinking about building me one of these, what do you think?

Do they make Jackson necks with black ebony fretboards and black headstock and white/cream binding?

I'd look into guitars from jackson/charvel with the same specs before building one, could prove much cheaper. Thats a fairly standard super-strat layout of one hum, one vol and a floyd, so i don't think it would be that hard to find a guitar to those specs rather than having to build it.

As of right now, Jackson doesn't make a 1 hum superstrat. That would be a custom order unless you found one used. You could also look into some old Japanese Model series Charvels. You could build one of those from parts for less than $300 if you're patient.