Re: How do I get Ace Frehley tone?
Yup, that is THE Ace Frehely sound, Super Distortion thru a vintage 100w JMP.  Unfortunately SD doesn't make anything that sounds just like the Super Distortion.
If you can, try to get a set of Super Distortions off eBay from the 70's or early 80's.  From what I understand, there really is a difference between the older one, and the newer ones.  
Of course, the lengths you go to really depend on HOW badly you want to get Ace's tone.  I know that when I get my Les Paul Custom, I'll look and look until I find a set of 70's double creme SD's, even if they cost me silly $$.
Oh, and don't worry about the neck pickup, I'm not even sure Ace know's how to switch to the neck pickup.  It was rarely even wired up in most of his guitars...he NEVER used it.