(Piloting mecha is a man's romance, so there's no heroine. Women would only slow me down.)
Lin Feng transmigrates to a cultivation world, only to be found to have zero spiritual roots and good-for-nothing aptitude, leaving him no hope of ever cultivating the Dao.
While his fellow disciples fly their swords through the heavens and the favored geniuses laugh among the clouds, he secretly kindles the first sparks of technology in a corner hidden from mortal eyes. Others refine pills; he smelts steel. Others arrange formations; he lays circuitry.
From the rudimentary construction mecha, the Pioneer, to the RX-78-2 that tears across the sky in the sect's hour of peril! As the beam rifle roars, a whole new era begins.
This path of "proving the Dao through technology" is a magnificent history of steel's evolution. He recreates Zeta's transforming frame, achieving seamless air and space flight. He unlocks the secrets of spiritual consciousness and creates ν Gundam's remote-funnel sword formation. He crosses worldlines, bringing SEED's Freedom, 00's quantumization, and Barbatos's Alaya-Vijnana System to life.
His enemies range from sect elders, to Nascent Soul monsters, to the "Heavenly Dao Observers" who cross the sea of stars. When the "Moonlight Butterfly" of the universe's end sweeps across all things, Lin Feng will pilot the ultimate mobile suit and make his final choice: not to ascend, but to forge a whole new Genesis for his civilization with a mortal's hands!
Although I know that the most basic integrated circuit chip can be made by hand rubbing, and the tester you prescribe to the protagonist who knows all the science knowledge can indeed make the protagonist make such a chip. But many people actually don't know. If your book becomes popular, there will be a lot of tricks to try to trick you. So I suggest you find a suitable place to add a sentence in the article about Zhao Jijia.