DNA and human brain.

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I have a question connected with the 'technological singularity' thread.

Can we assume that DNA is sufficient for coding of a human brain? (This is one of the key claims advocated by Kurzweil.)

Imagine a big factory that can produce cars, ships etc. In order to produce something one needs to supply a set of instructions for this factory: drawings, material description, etc. Can we say that this sets of instructions are equal in complexity to the things that are produced?
To me it is not clear. Without all the machinery of the factory these instructions are useless. Complexity of produced things = complexity of instructions + complexity of factory.

may be my view is too simplistic, or even wrong, but it seems to me that DNA is probably not coding the cell machinery, it codes the modifications of the cell. (We need to insert DNA in a living cell in order to produce something usefull.) So the complexity of human brain = complexity of DNA (300Mbyte or something) + complexity of a single cell (10^n megabyte).

Does it make sense?