Regarding the Armored Car design, what was its status in Da Vinci's time?

Conceptual design; lacked appropriate engine/transmission

The Armored Car, or what is commonly recognized as an early conceptual design for a tank, remained firmly in the realm of theoretical engineering during Leonardo da Vinci's lifetime. The detailed schematics captured his vision for a protected infantry assault vehicle. However, the text clearly specifies that its realization was halted because the necessary supporting technology, specifically an appropriate engine and transmission system capable of powering the heavy wooden structure and metal axles, did not exist at the time. While his patrons were interested in military applications, the technical hurdles related to power generation and mechanical translation of that power into motion were insurmountable with the available Renaissance technology, leaving the concept confined to his notebooks.