I Became a Giant and Chose to Join Li Shimin

I need to finish researching the Sui and Tang dynasties before I can write the full blurb. Here's a quick outline for now: A woman transmigrates into a man's body, becoming a two-meter-thirty giant with unmatched strength, and follows a young Li Shimin as he conquers the land. No romance, mainly family affection. Li Shimin raises the protagonist as half a son. A silly, lighthearted story centered around historical figures. Theme: Happiness