The Offensive/Defensive looks like a good way to limit the Massive Gun, Tiny Base thing that is possible. However, there definitely need to be some smaller weapon mounts (e.g 1/2 AD, Normal Range = 1/2 listed HPs) to allow some races to utilise the smaller cores.
I've been playing with some of the weapon load outs for a variety of races and found some potential problems, mainly in the bang for buck scheme of things.
Shadow Molecular Slicer Beam (4 HP) shares the same traits and AD as the Minbari/ISA Improved Neutron Laser, but loses 18" of Range. I'd suggest upping it to Quad Damage and/or altering the AD.
Narn Heavy Laser Cannon (3HP), shares the same traits and AD as the EA Heavy Laser, but loses 9" of Range. I'd suggest increasing the range or AD.
Drakh Neutron Cannon (3HP), shares the same traits as the Minbari/ISA Neutron Laser, but loses 6" Range and 1 AD. I'd increase the AD.
Compare Dilgar Imperium Heavy Bolters (access to MoD) with the pak'ma'ra Heavy Plasma Cannon (less range, less AD same traits and HP cost)
Compare Narn Light Ion Cannons and Abbai Quad Particle Array, Same cost and traits, Abbai get less AD.