Ive never seen production or custom surfboards follow that pattern through their size range. Some will preserve more width or introduce more hip or whatever as they size down within a range, but I haven't seen a model of board that is wider in its smaller sizes than in its larger sizes.
Just a quick look at any surfboard site like rusty, channel island or firewire and you can see the scaling of width and thickness within a model line scales in the same direction as lenght.
Of course you as an individual rider need various proportion boards that dont follow that simple scale to match to various conditions. My big board is 5 inches shorter than by little board.
A shaper that shapes you a quiver designed to cover a range of conditions will scale boards based more on volume, but thats not what is represented by different sizes of a board for retail. Those are pretty much across the board designed for different size riders.
Even a quiver of boards for one rider by a single shaper are not really boards of a same model. They are a small wave model up to a gun and would be analogus to multiple models within the range of any brand.
You can easily pick an appropriate quiver from any surf or even kite brand that follows the scaling you mention, but I dont see any difference in how kite and surf companies size their gear within any given model of board.