This is a very detailed and interesting article that covers scaling designs down to model size. There is a lot of discussion of the hydrodynamics of a hull and how that changes with size/scale changes.
Many of the issues would affect making changes (especially in size) to a hull design in "full size" craft. The old rule of thumb about not stretching/shrinking a hull more than X% (usually 10%) in length without redesigning/reconfirming the calculations… a lot of the ideas behind that can be seen here. Not to mention many of us boat builders (myself included) either got started by making models, move that way later, or wind up making 3-D models to study designs.
Other aspects of taking models for hull tank testing including scale hull speed and behavior are discussed.
All-in-all a wide ranging, detailed discussion.