You can do whichever you prefer but I will say if your Nat’s gear is good all you really need to convert from the Nat’s Slayer version to mine is a decent Nat’s ring and a good Dawn. The Dawn could be handled with crafted Primal recipe but also, since you will have tons of cooldown reduction on your gear for the Nat’s Slayer Version you can get away with a less than perfect Dawn. One with 62% or 63% Vengeance cooldown will definitely be good enough.
The ring might be an issue but as long as it has either Crit chance or Crit Damage it should be good enough. Crit Dam is better since you can get crit chance from the Sliver of Terror.
That might be hardest part though. It seems to me that the attack speed/crit chance Sliver of Terror is easier to get than a Ring of Fire one but it could take a few tries to get one with a good affix. But if you can, try to get one with Damage Reduction vs melee.
But like I said, if you would prefer something Marauder, that’s okay. There is a Marauder in the Top 10 but he’s got 4000+ paragon. The other Nat’s player near me also have around 4000 paragon. Not sure if that matters to you though.
Definitely should do what you want. The point of the game is fun and learning to Marauder is a good way to do it. I don’t much like that set but it’s been one of the best sets in the game for a while now though it did get a nerf in the last patch.