I learned that this is a bad idea the hard way. Base Augustus, which was located on the island of Sicily, was my primary base. I built a second base -- Balto base -- in Cuba (I have a thing for island bases for some reason...). Built a charlie, staffed it with soldiers. It ended up being so much damn upkeep that I actually had a defecit one month.
I... really hate that to be completely honest. I was hoping this game would be more flexible. Honestly, I also think that small arms in this game are WAY too expensive. Why is one laser rifle only $10,000 less than a huge laser AA battery? I may have to make some changes to the game, but doing that feels like cheating. I'm thinking $20,000 for rifles is much more agreeable (after all, this is 1979 money we're talking, here).
Also, you are going to need infantry in your bases anyway, in case they get attacked.
One thing I did consider, though, was building dedicated facilities. Like, a small base specifically for research. 4 labs, a store room, some living quarters for security/scientists. A nice, tucked away science base to send my Anomalous Materials to.