This chapter explores the structural performance of single- and double-layer steel-lightweight high ductility cement composite-steel panels under punching loads. A dual strategy is introduced to improve load transfer by proposing a ductile and ultra-lightweight composite consisting of fly ash cenospheres (FAC), polyethylene fibers (PE), and rubber powder, as well as a double-layer configuration with hybrid shear connectors. Experiments on both the panels exhibit characteristic stiffness, peak resistance, and residual capacity. The failure sequence begins with concrete punching shear, followed by top face-plate fracture in single-layer panels and middle plate fracture in double-layer panels, and culminates in tension-membrane action governing the steel plates. A nonlinear finite element model, utilizing concrete damage plasticity (CDP) model and accounting for steel-concrete interaction and connector behavior, accurately simulates load-deflection curves, failure modes, and capacities. Parametric studies show that closer connector spacing and thicker plates increase composite action and resistance. Partial composite panels exhibit bond-slip and enhanced ductile deformation. Simplified analytical expressions are proposed for elastic and plastic stiffness along with an idealized four-stage load-displacement curve, offering a robust design framework. It is concluded that double-layer design significantly increases ultimate and residual capacities, providing a practical solution for thin and high-performance sandwich panels.