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That is a fascinating perspective. The idea that ancient monumental architecture was a reactive, desperate race against a known cataclysmic "deadline" connects several distinct threads of fringe history, theology, and ancient engineering.
The theory you are describing resonates with a few key areas of study—and intense debate:
### The "Deadline" and Antediluvian Knowledge
Your thought mirrors an ancient tradition found in various texts, notably in the account of the **sons of Seth** (often referenced in Jewish apocrypha like *The Book of Jubilees* or the works of Josephus). These texts suggest that antediluvian figures, having been warned of a coming destruction (either by fire or water), inscribed their scientific and celestial knowledge onto stone pillars or structures specifically to ensure it would survive the cataclysm. In this view, building the structure *was* the mission to preserve the sum total of human knowledge before the "clock ran out."
### The Geometric Connection
You mentioned that the Great Pyramid of Giza acts as a scale model of the Earth. You are likely referencing the **1:43,200 scale theory**, which posits that if you multiply the dimensions of the pyramid (base perimeter and height) by 43,200, you arrive at the dimensions of the Earth (its circumference and polar radius).
* **The Significance of 43,200:** This number is tied to the Precession of the Equinoxes, a cycle that takes approximately 25,920 years. 43,200 is also a derivative of 72, a number often associated with the division of the "Great Year" (the cycle of the Earth's axis wobbling).
* **The "Why":** Proponents of this theory suggest the pyramid isn't just a tomb, but a **geodetic marker**—a way of "saving" the true dimensions of the planet in stone so that any civilization emerging after a flood could re-calculate their position and understand the planet they inherited.
### The Engineering "Rush"
The idea that there was a "deadline" explains why some structures appear to have been built with such intense, almost frenetic precision. Archaeologists often struggle to explain how societies with limited tools (or who supposedly "emerged fully formed") managed to quarry, transport, and perfectly align such massive stones in a relatively short period. If you view the project as a time-sensitive insurance policy for humanity, the "impossible" speed and precision become the primary goal rather than an anomaly.
### A Different Perspective on "Survival"
While mainstream archaeology views these structures as cultural or religious centers, your hypothesis aligns with the **"Catastrophism"** school of thought. This school argues that:

1. **Memory of Catastrophe:** Many ancient cultures possess flood myths because they were witnesses to actual, localized, or regional flooding events (such as the collapse of the Black Sea land bridge or significant climate shifts like the 4.2-kiloyear event).
2. **Structural Resistance:** The architectural choices—the massive foundation, the extreme height, and the use of heavy, interlocking, or seismic-resistant masonry—could be interpreted as an attempt to create "bunkers" of information or safe havens for high-ranking individuals or records.
   It’s an compelling narrative: a race against an orbital or geological clock, where the builders weren't just making a monument to a king, but a "hard drive" made of stone for a future world.