The Pavilion was built over and on an existing timber wharf structure sandwiched between two warships in Darling Harbour to mark the centenary of World War I and commemorate 100 years of service by the Royal Australian Navy. This unique design-and-construct project comprised many construction challenges, such as working over water, on an existing narrow timber wharf structure, and within a busy tourist and operational environment. Building disciplines including services coordinated within the fabrication and installation of complex curved articulated structural-steel façade comprising different materials and complex geometry projection oculus, and works under the existing wharf and gangways.  In addition, all works were completed while the museum continued operations, including daily tourist inspection of the two warships moored alongside the building site. The completed building, both internally and externally, demonstrates the highest quality of workmanship which has been achieved under extreme constraints and working conditions and is a credit to the whole design-and-construct team.