That's great! I've been thinking of starting a similar project. What fork/ version of news/arc are you using, and could you provide some technical details about how the parent site is implemented?
The whole site (including LGBT News) is built from scratch, using PHP and MySQL. I came across a few turnkey Hacker News sites, but didn't really like any of them. I decided to build LGBT News from scratch just because I thought it'd be easier to integrate into the existing site, and I thought it'd be a fun project (I usually tend to do that for the learning experience).
Login uses Facebook Login (which has been a huge headache), countries and regions were implemented using an ISO database, and some of the additional data (population, religions, etc.) comes from Freebase.