QED Naval has drawn up plans of a new MultiCat design construction barge. This 25m, 150t multi-faceted design would be used as a construction barge for the Subhub, quayside and pier developments, and deployment of marine renewable systems. This involved developing the hull lines of the vessel within, producing the hydrostatics and stability assessment. We have since provided an indication of the powering and scantling requirements. This has recently been taken further with and assessment of its motions characteristics whilst in operation in waves using ANSYS AQWA.