I Was Caught Working Part-Time During the Summer Vacation. Where Did You Get This J-20?

Blue Star engineer Chen Hao traveled through time and became a junior student. In order to supplement his living expenses, he worked part-time in a scrap car yard during the summer vacation and awakened the system [Starry Sky Technology]. A few days later, a group of armed police surrounded the abandoned car park where he worked. "Where did you get this fighter jet? Did you collude with foreign arms dealers? Tell the truth!" "Officer, I really assembled this myself using scrap car parts... If you don't believe me, look at it..." "Why don't you say this is a spaceship and it can go into space?" The police chief said disdainfully. "This is a bit difficult." Chen Hao thought seriously for five seconds: "I have to add more money." Expert: "????"