This thing was just recently brought up in the "Autobots Roll out!" thread. People constantly mention jacking into it, but I wonder if "no autonomy" and "not build for remote piloting" mean that you simply can't do that.
Regardless, I'm wearing one of these inside of a Rigger's Cocoon (should fit if in foetal position) while jacked into a walker-modified bike with four guns. Now that's a mecha! I put two guns on the Iron Will as well, so I figure even if I can't jump into it, my sprites will be able to man the weapons. I may only have 1 IP myself, but if my guns have 3, it's fine.
Also, they probably don't need that much to hurt you in it. On an automatic with 6p during a narrow burst, they'll do something like 10 damage already, with your 12 armour (since the thing has 6 body) you're only going to stop 4 of that, on average. It may be modified as a vehicle, but it isn't one, so I'd say they don't have to destroy it, but just shoot at you, so without that that 10 damage would easily inflict 7s on you, not counting your personal armour.