I like the premise of your question; we are all modelers. Again, I have the utmost respect for all scratch builders however I wonder if one can truly be considered a scratch builder if that modeler uses someone else's plans to fashion their raw wood, plastic, metal etc. to build their projects. Now if you can design your own vessel weather by pencil and paper or CAD then take raw materials and go to work, well now you have a category that may just better describe a scratch build. For some reason this discussion tugs on my philosophical side.
maybe i can shed a little light on your philosophical side. To begin all modeling and model engineering have their own rules and definitions. Take model aviation as an example There is an article in the AMA mag. that defines a scratch build as one where the builder is also the original designer. If you build a model from someone else's plans, then the model is a "plans build" rather than a "scratch" build.
For years i was a judge for a model ship competition and the rules were set up by a committee for the museums. It is not possible to model a historic ship unless you're starting from the original set of plans. unlike the AMA where the builder is also the designer. All ship plans are basic information and usually do not have construction details. So a scratch builder is starting from a design concept and filling in all the missing information, that is scratch building. Now if a builder starts with a set of modeling plans done by someone else than that builder "scratch built the model from plans" All the finer details are filled in which removes the "creative artistic vision" BUT the actual model is still scratch built if every part was fabricated by the builder.
SCRATCH-BUILDING IS WHEN a full-scale set of drawings are scaled down to whatever size that you want. The structure is drawn, and then the parts are cut and assembled. When you build from someone else’s plans, you are plans-building. Someone else designed the model but you are scratch building the model itself. If you start with all of the parts cut out for you, you are kit-building. If you buy it and only assemble the main parts, that’s kit bashing. It’s that simple.
Scratch building is the pinnacle of scale modeling artistry, allowing modelers to create unique pieces from raw materials. This technique offers unparalleled creative freedom, enabling enthusiasts to bring their visions to life without the constraints of pre-made kits. Whether recreating historical artifacts or designing futuristic concepts, scratch building opens a world of possibilities for skilled modelers.