The idea is to clear trash mobs with ball lightning and gun down elites and singletons with rapid fire withering fire.
The upside of this build is that it clears extremely fast and is a blast to play. The downside is that the MP you can play on is limited by your DPS. This build affords you a lot more mobility than most traditional RF builds because it uses ball lightning for quickly clearing trash / kiting elites, and uses rapid fire//withering fire so that you don't have to be rooted to the ground as much.
The only real requirement for this build (other than the skill choices) is to have at least 2.00 attacks per second. (Make sure that you're actually over 2.000001, and it's not rounding up to 2.00 from 1.999, you can do the calculations, or just be at 2.01 to be safe.) This will get you a lot of damage out of your rapid fire and make firing off BL a lot of fun. 2 handed xbow will probably get you the best DPS, but its a lot easier to get to 2.01 aps with a 2 handed bow.
You're also going to need some pick up radius, I'd recommend getting at least 12 yards. I got mine on boots and bracers. Boots because you don't lose a whole lot (only 65 dex in my case) and bracers because I needed to pick up attack speed there anyways.
Make sure to play on low enough MP that you can clear trash mobs in 3-4 shots and elites in under 10 seconds or you wont generate health globes fast enough to keep your hatred up. My gear, for example, lets me play on MP 6 at the most (at time of writing I'm at 277k dps while using an SoJ).
Happy hunting. Feel free to ask questions here, or contact me in game.
(Nyan has some rad guides too, check out what he has to say).