This isn't really too advanced, it's just a breathing EPP, but it lets you move around in zero-g as if you had a mech but maybe a bit less control ie. longer acceleration/braking. It would also be fitting to add a low energy cost and maybe some kind of tethering system for mechs.
Sounds nice, maybe you should come up with the crafting recipe, too. Also, when is it made? Is it after the rad-pack, before, or is it the new final stage?
I would say, the last stage, taking the Cold EPP and adding stuff you get from mech missions enemies and loots