It could be made, but without all the features.
The mech itself? Yes.
The AI function? Possibly.
Huge? You have to be pretty stupid to mess that up.
Guns? Look at Gcats mech, same mechanic.
Turns off? Another possibility.
Can't jump? That's to easy.
Teamates can ride on your back? Maybe, code is in the Rowboat, (Being a bot, vehicle)
Self-operation. Can't, to hacky and restrictions.
Now that i've cleared some of the "its not possible" stuff up. Someone for the love of god, consider it.