[wubbfindel]

Interesting reasoning. But isn't it true to say that the "complex existing machinery and parts" which interprets the DNA was itself put together from instructions found in other DNA? I suppose that metaphors are rarely entirely comparable.

[Tuna-Fish]

Some of that machinery and parts isn't directly represented by DNA. As an example, DNA codes some proteins that help extend cell walls, but those only work if you already have cell walls. If you have only the full DNA for a cell, and no other knowledge, you cannot build that cell out of that.