Milestone aims on decision whether the current stage of development of the individual subsystems of the HEET II project allows their integration at the underground research stand. This decision depended mainly on the advancement of design, assembly and research works on respective components of the system. Consultations between the consortium members were carried out on an ongoing basis to assure adequate preparation of the subsystems to make them compatible with each other. After obtaining information from all partners about the possibility and readiness to assemble the individually developed systems, it was decided to proceed with the integration of elements on the prepared underground test stand.