One more question - I'm gonna get rear routing for my warmoth body, and I wanted to know whether I need pickup rings or not - I'm not entirely sure when they're supposed to be used, and whether they'd be necessary on this as I have covered pickups (does that even make a difference?)
Up to you, really - if you don't have pickup rings you'll have to screw the pickups directly to the body. One school of thought is that this improves the tone because the pickups vibrate with the wood; with rings, the springs act as a sort of suspension system to (partially) isolate the pickups from the body's resonance. Of course if you have direct mounting with springs or foam
under the pickups to adjust the height it negates most of the resonance thing anyway.
Covered pickups make no difference to the direct mount/ring mount question, although if you went for direct mounting I suppose the covers would protect the exposed parts of the pickup.
Personally (FWIW) I prefer mounting rings, because it's easier to adjust the height and they just look tidier.