I am hard pressed to think of any nerd females I've known well enough to observe them in any detail, who I would actually consider non-pretty.

I'm torn about saying this because this kind of message probably good for everyone's self-esteem and I think nerdy girls on average should be more confident, but... what's with all these pretty nerds? Is your standard for pretty relatively low or are you just really lucky? In my experience and in common stereotype nerds of both genders are, on average, less physically attractive than the rest of the population, once you control for socio-economic conditions that influence things like diet, hygiene and exercise. Good looking people tend to end up on anti-nerd life paths earlier in life, less good looking people have less of their time taken up by socializing leaving them with more time for nerdy activities and more incentive to develop other aspects of themselves (since they can't coast on physical attractiveness). I've consistently found that less physically attractive people are more intellectually interesting.

This doesn't mean your advice is bad- nerdy girls are awesome and totally are capable of getting together with lots of nerdy guys. But I don't think we need to mythologize the nerdy female this way and it seems a bit patronizing to pretend the self-assessment of nerdy women has no grounding in reality. Just like how not everyone gets to be smart, not everyone gets to be physically attractive.