I cannot answer this question myself, as I have never built a model boat, other than airfix and revell plastic warships in my younger days, but I have made a few dolls houses over the years. And all from parts I have bought to adorn the scratch built carcasses.
However, I see an ever developing trend of people on different forums "scratch building" their model ships, but resorting to buying the services of people with 3D printers to produce exquisite fittings by robotic machines for their models, or going to the expense of buying a 3D printer themselves to produce their own fittings.
Now is this scratch building as some people state, and [as I feel, not] what category would it fall into in a club or show competition.
And does one get anywhere near the same enjoyment in letting a machine do the work for them, rather than their own fingers and dexterity.
Jim.