The point is broader than the design of giraffes, but attempting to extrapolate what god would have done from what you would do is pretty hopeless. 🙂
I lived with a girl at one stage who might charitably have been called a ghastly skank. She was a believer, and was confident that god wanted her to have fun as she saw fit. This included drinking to the point of public incontinence. She did not (as far as I am aware) have a revelation of the divine will particularly, she just assumed that god would approve of her personally. This seems to me to be even more implausible than the existence of god.
Likewise with giraffe design, it seems less likely that their is a god who designs giraffes according to a pattern that we can readily understand than that there is a god at all. Although I persist in thinking that religion is a different sort of belief and a different form of truth and therefore that Dawkins and his ilk are barking up fundamentally the wrong tree. 🙂