Well, I think that yes, it will qualify as a "bang".

Let me know how it goes.
Jaid - you're right. You can only have one weapon mount for every three Body points. However, you do round up so the Tomino with its four weapons and Body 10 is actually RAW-compliant. It's the Centaur that unfortunately isn't because heavy weapon mounts count double.
Thanks for pointing that out. I'll consider what to do about it. Synner mentioned the rules for increasing Body at the cost of speed which didn't make it into the book but may appear in a FAQ / Supplement. Perhaps I'll use those.
In the meantime, I'll have to advise people not to use the Centaur drone.