It sure seems like there are a lot of Xbox modders when you're on an Xbox modding forum... Thing is, in real life, we're spread pretty thin across a great deal of space, and that's just us males. Trying to find a female xbox modder is like trying to find 1 needle in a million haystacks.
Girls generally aren't into geeky things like hacking/modding game consoles. Yea, a few girls are, but they get the pick of the litter when it comes to picking a guy since there are far more geeky guys than geeky girls. The best you can hope for is finding a girl that says "okay, whatever, have fun" when you say you're modding your Xbox. However, if she says "Why the hell are you wasting your money on that?!" you really didn't do such a good job picking a girlfriend.
The whole thing about girls is meeting them halfway... She's not gonna care about your pimped out computer and you probably could give a rats ass about her stuffed animal collection - maybe you have similar tastes in TV shows or music, that's a good start. Relationships are all about companionship, sex and some common ground interests - if you're trying to find a perfect match you'll be searching for a long time.