David Hathaway owns Paper Shipwright, a company in the UK that produces some very nice and well designed paper models of unusual ships. Here is one of his latest in 1:250 scale of a Grab Dredger. The initial design is from a Scottish firm Seadrec. The "Maria" was never built but rather a model based on Seadrec's plans.
This model is certainly not my best work, however it was a fun build.