Wow. As someone who has made my own system before, it's clear you've put a lot of work into this. Kudos! I never would have thought of making such a campaign. You've come up with a lot of items I wouldn't have considered. If you're trying to expand items, I would suggest considering robot features from other series, see what comes up. Ideas that come to my mind: possible sonic/sound powers, sonar sensors, water proofing/travel powers, telekinesis/telepathy head items, spring/jumping legs, an energy tank backpack, enhanced 'super' strength arm/shoulder items, a breath attack/weapon in the throat, and not to mention ride armor skills/powers. Just some things off the top of my head. I'll be happy to help out with anything you might need, so just let me know ;)