Sometimes when you need a Terminator, a crazy puppet backpack will do. Sometimes, you’ve just gotta go a little further. And when it came to Terminator 3, the effects team took the second option and basically built actually Terminators. Almost.
https://gizmodo.com/t-600-is-a-fantastic-backpack-for-exterminating-mankind-621931354
In this behind the scenes video from the alway-enlightening Stan Winston School, some of the minds behind the machines in Terminator 3 explain their process, and the takeaway is that there is/was at least one, fully-drivable T-1. All that’s missing is the bullets. And the orders to kill.
And hey, if you are going to leave two things out, those are probably good ones to pick.