In the context of designing of customized products, ensuring the verification of requirements and stakeholder needs in an efficient and cost-effective manner poses significant challenges. This paper proposes a Virtual Prototyping approach, integrating Computer-Aided Design and multibody modelling, to leverage their respective advantages. The presented case study involves the integration of two pre-existing robots, a cobot and an Autonomous Mobile Robot, to realize an Autonomous Mobile Cobot tailored to the specific needs of a manufacturing industry. Through Virtual Prototyping approach, part of the requirements, including spatial and assembly constraint, are verified by means of CAD, while interaction and behavioural requirements are verified through multibody modelling and simulation. This work highlights the efficacy of Virtual Prototyping in achieving comprehensive design verification for tailored products. By simulating the behaviour and performance of the designed system before physical implementation, Virtual Prototyping reduces the time and costs associated with traditional trial-and-error methods. Moreover, it enables a more thorough exploration of design alternatives and optimization strategies, ultimately improving the efficiency and effectiveness of the design process. This integrated approach showcases the potential of digital tools to enhance the development of complex industrial systems, paving the way for tailored solutions to meet evolving market demands.