As digital twins gain momentum in their usage in diverse domains, the concept of Asset Administration Shells (AAS) has become very relevant for achieving the digital twin approach, where Administration Shells are the digital representation of physical assets. Being a relatively new concept in the Industrial Internet of Things (IIoT) domain, the tools and approaches for creating and deploying AASs are likewise in infancy. This paper introduces an open-source tool, Papyrus4Manufacturing, which provides a model-based systems engineering approach to the AAS. This toolset supports the creation of AAS digital twins from modeling to automatic deployment and connection to assets using the OPC UA protocol. This paper also includes an evaluation of its usability, as it is put to test with an academic use case.