"Except of course that with all my
 components I'm nowhere near 1 billion tons so I could
 reduce the size of the thing and still fit in everything"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Does this system have any military bases?

Even if there's no IN or ScoutService bases there still could be  ones (paramilitary?) that are local.
According to the CT HG LBB there should be a 'local navy' in any system that has a TL that's high enough.

Since you have all that space, you may as well use it up...

==============================================================