Hellknight plate for antipaladin?
 

I want to copy/create a type of Hellknight plate that gives the same benefits (ie reduces the armor check penalty by 1, increases the maximum Dexterity bonus allowed by 1, and moves at full speed. At 5th level, these adjustments increase to 2. At 8th level, these adjustments increase to 3.) to an Anti-Paladin.

Trouble is I'm really useless when it comes to this stuff. Can anyone direct me to what I need to change and to what?

Thanks