My Cannon Fodder Has Just Grown Up

A mecha master from a higher civilization was reborn in the world of a novel called "The Revenge of a Famous Daughter" and became a short-lived little cannon fodder who was never shown in the plot of Shuang Wai Wai and huddled in a poor mountain valley. In order to make a fortune and become well-off, I have to pick up my old trade and become a little expert in mechanical modification! He has been able to repair cars and transform them into tanks. He is so ingenious and cute^_^