A floating moored oilfield production structure for deepwater application. An apparatus and a method for the construction and installation of floating oilfield production structures, wherein the deck structure is supported by multiple pairs of inclined buoyant legs which in turn support a subsurface damping plate structure for reducing the motions of the platform. The structure initially is initially constructed in a first configuration in relatively shallow water and then towed to a deepwater location where it is reconfigured to its operational configuration. The major structural components are joined by selectably operable pin connections.