We've had a couple of industrial boats recently for those who like a bit of rust and grime, time for something completely different.
These yellow water taxis were moored up in Sydney harbour in 2014. They look like fun, nippy boats if you like that sort of thing. I prefer big boats that move slowly without providing thrills, but then I'm a wuss.
In model form, they would be great fun. You'd need to injection mould, or more likely vac-form, many of the curved body parts. The rubber outers (I assume these are RIBs) would be pretty much impossible to make in the real material without serious investment, but more vac-forming might look OK.
The biggest problem might be passengers. You'd want to build these quite large and unless you use 3D printed, hollow people, then they would be quite a weight. Heavy loads in small boarts aren't a recipe for success, unless your aim is to win our club trophy for the most exciting sinking...