48 would be more than enough, it's will never be a G3 system but you seem to be aspiring to that spec. Have you considered standby time, I prefer more PSU's i.e. PSU200XP and 7Ah batteries over 17Ah.
In fairness some of this is completely pointless overkill (we have to assume the risk based on DIY), your bound to have unnecessary headaches with G3 kit which is some of PJ's point.
I still can't agree pointing any movement sensors towards windows/openings is in anyway correct or has faster detection, you'll also never find a manufacturers instructions to concur with this.
You can get crosstalk with MW, I only fit Optex ones with anti-crosstalk but none of your sensors are close enough.
I'd say it's only the "pointless" hall one with any chance of MW leakage outside the protected area, I'd also assume K band MW which has less wall penetration.