I've been playing around with this mod for a bit, and really like the ship designs and some of the weapons. However, I did notice a few things that made fighting these guys a bit repetitive -- in my current save, they seem to be present in about 20-30% of unexplored systems, usually with a ton of big fleets around as well. The drops don't seem all that worthwhile either, though I am wondering if that's due to a bug somewhere -- I'm not getting any survey drops from the motherships. Weapon drops may also be a bit too common, as a typical exploration run (10-15 systems) usually gives me several stacks of each.
With a bit of balancing, I think this could be a really fun mod. Keep up the good work!