You're all still discussing things that I consider already solved on my wiki article.
@OsakanOne, the wiki page I linked basically says this: if you fire a weapon that's meant to destroy a power armor, then it'll likely have the potential to be lethal. Just like knifing someone will probably be lethal too. But a lethal weapon doesn't mean that it will be applied as lethally as intended: knife in the chest is far more threatening than knife in the shoulder. But a knife is unlikely to harm a power armor. A power armor weapon is more than likely to splatter someone non-armored. An anti-power-armor weapon is pretty unlikely to destroy a tank or a shuttlecraft even if you hit it in a tender spot, but fire enough times at the same place and deterioration probably will do the rest. That's a different deal if you're running around with an infantryman with a bazooka; the bazooka can probably do something to the tank, right? Odds are a power armor needs to watch out for it too. Etcetera etcetera.
As for the nuances, the GM figures those out. No HP system, because life doesn't have HPs. If you want a plotshield, then that's your energy fielding/forcefields/barrier. There's a suggestion for how good they could be, but their endurance is really up to the GM and his interpretations of the unit.
@CadetNewb, you're worried about nuances. That 8 SP versus 10 SP, that 8 SP versus 16 SP. I maintain that it doesn't matter; the narrative doesn't have enough pull typically to make it be significant anyhow. If you have a heavy power armor, then you have a heavy power armor and that's it. If a GM wants to maintain that one needs to be seen as more rugged to another, that's his call. We can't stop it, and we honestly shouldn't try anyways.
I keep expecting help just to make refinement. If this keeps up and that no one is interested - heck, the feedback I get is "I understand fine so far" - I'm going to submit it and put an end for this years-long sordid affair. If you want to influence it before the die is cast, I suggest you do it now. I'm sick of seeing these topics around.