Early Wanchai Shipyards

Cropped from Panorama of Hong Kong, taken from Happy Valley Beato and J Hentry Hering

Shipbuilding in Wanchai started in the mid-1840s already. On Marine Lot No. 31 the Emery & Frazer Co. started business and constructed a slipway. After many changes in ownership, in 1856 Ross & Perkins Co. expanded the shipyard into the adjoining Marine Lot No. 36. In 1868 it was known as the Victoria Foundry. In 1870, John Inglis took over the Victoria Foundry. (Source). More information on the later development here.

I think the premises mentioned above are the ones between J and K of Herostratus' annotated version.