Ming Dynasty: Tanks blocked the door and you said to me, "Long live Ming Dynasty"

1627, April 8.
The Ming Dynasty welcomed its last emperor.
Emperor Chongzhen Zhu Youjian stood on the steps of Jianji Hall and accepted the worship of all officials.
Just when the coronation ceremony was reaching its final stage, the late emperor Zhu Youxiao suddenly appeared at the door of the hall.
"Chongzhen, please don't ascend the throne yet. Let me fake a corpse first!"
A firearms engineer comes to the Ming Dynasty with the memories of his past life. What kind of changes will he bring to this crumbling building?