This is a model of a harbour tug, but not a specific type. Rather, I have taken different elements from various classes of tug, to try to represent all in a generic example. Specifically, it is a tug from the Manchester Ship Canal Company, as identified from her colour scheme: Black hull, red deck, buff superstructure, white upperworks, and black funnel finished-off with twin white stripes. It has a tripod mast; bridge wings, navigation lights, and loudhailers around the bridge; a winch, hydraulic pins, and bollards at the stern for pulling ships; and a large fender on the bow for pushing operations.
I built this to honour my family members who served in these and other vessels on the canal, including my grandfather (who ended his career as a Chief Engineer in these boats), and those who serviced & maintained the vessels at the company's own shipyard: Old Quay Yard in Runcorn.
I think this would make a great set because it an easy build using existing LEGO bricks.