I need a complete 3D CAD design for an autonomous charging dock that works exactly like the one shown in this reference video: https://youtu.be/R_d7B76bOeE?si=3clzqgDhOCUmaTiw. The dock must accept a quadcopter, pull it to the precise centre after touchdown, then charge it through a pair of spring-loaded pins. Deliverables : An complete 3-D CAD files including pin-out for the two-pin charger from the metal tubes has shown in the video .