CAD Design for Working Plastic Product

-We need a working CAD design of our product. Product is small and consists of working pieces and a detachable piece, it will be made with Injection Molding. -Mechanical engineering background. Experience problem solving with small, interlocking parts. Understanding of latches, connectors, push lock, push eject, mounts. -Design made under specific size specifications which will be given. -Working solution needed.