Total Panel Weight in thin marble engineering refers to the significantly reduced mass of a composite stone system compared to traditional solid slabs. In the framework of Modern Engineering, the shift from a 2 cm standard slab to an Extreme Lightweight composite—utilizing 1200–3000 micron marble veneers—results in a weight reduction of up to 80%, enabling natural stone to be used in weight-sensitive sectors like aviation, marine, and high-rise architecture.