Argh, you lost me at space elves and pregnancy tropes...
Vulcans and Romulans were NOT space elves. They had pointed ears because it was an easy way to show that they were alien. Given the tech available at the time, it was all props and make-up, and no CGI available. If anything, Vulcan culture was based on Chinese/Japanese culture. Romulans are almost perfectly Roman. Klingons are as militant as the Mongol hordes. And so on... no elves, trolls, orcs, naga or neko there.
And what you propose as far as the varied species sounds a great deal like CJ Cherryh's Compact Space/Downbelow Station work. Except for the MC getting everyone pregnant. Geez, you'd think a spacefaring race would have reliable contraception...