Software copyright description: The 'Customized PCB Stackup 3D Design System' represents a high-end professional software solution within the domain of Electronic Design Automation (EDA), specifically engineered to resolve the fragmentation and inefficiency prevalent between stack-up planning and three-dimensional verification in conventional PCB design workflows. It deeply integrates parametric stack-up design, three-dimensional physical modelling, and real-time electrical performance analysis, thereby furnishing an integrated design verification platform - from stack-up scheme conception to three-dimensional prototyping - for complex PCBs utilized in high-speed, high-density, and radio frequency applications.