Indeed she made a SketchUp model of the H28. See here. I think the author is using the model more for planning the build. She developed the model from the lines drawings in that example. The table of offsets is available in the book she referenced.
I’ve draw a few boat hulls in SketchUp. You could develop a hull and create lines and ToO but SketchUp won’t be able to tell you things about where the water line will be for various loads or the righting moment or other important info. You might want to look at DelftShip for designing your hulls. If you want a SketchUp model, you can get files from DelftShip to import into Sketchup.