I wonder to what extent you should say you "rebuilt" something when the most basic hello world example doesn't work. And I wonder to what extent it makes sense to call it "from scratch" if you inherit a battle tested extensive test suite from the thing you're rebuilding, and the thing you're rebuilding is part of the training data.

Here's the first paragraph of Harry Potter and the philosopher's stone. I rewrote it from scratch, apparently:

Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they were perfectly normal, thank you very much. They were the last people you’d expect to be involved in anything strange or mysterious, because they just didn’t hold with such nonsense. Mr. Dursley was the director of a firm called Grunnings, which made drills. He was a big, beefy man with hardly any neck, although he did have a very large mustache.