Interstellar Mechanic: I Raised My Sister on a Junk Planet

[Veteran King + Hardcore Farming + Brother and Sister Healing + Technical Invincibility] I was once the strongest mecha maintenance officer in the empire. Now, I just want to open a repair shop on the garbage planet and raise my picked-up sister safely. However, the tree wants to be still but the wind does not stop. The former enemies and the bullies in front of me all want to touch the bottom line. I originally wanted to keep a low profile, but the "Strongest Mechanic" system insisted on me showing off my skills. Use scrap metal to build an Imperial Guard-class mecha? Use cans and bottles to create an ecological recycling system? I don't want to either, but the system gives me too much! I wanted to guard this three-quarter acre of land, until my sister took my homemade "toy" and blasted away the interstellar pirate flagship that was looking for trouble... We both looked at each other. "Brother," she blinked her big innocent eyes, "this... Seems to have caused trouble?" I looked at the approaching imperial fleet and alien nest in the star sea, sighed, and silently picked up the tool box at my feet. You guys don't understand at all. I'm a repairman and it's reasonable to carry a few "gadgets" with me for self-defense, right? This is a heartwarming (?) Passionate story about a retired boss who originally wanted to farm but was forced to start a business. He used a wrench and full-level skills to create a peaceful and pure land for his sister in the interstellar space.