Massive wall of text incoming:
Well, there's only two maps in your mod right now and they're both extremely large, so I figured a smaller map where fleets contact sooner would be a bit more fun.
Some more feedback after more time spent playing:
Due to structures taking up few slots, players can easily build massive amounts of orbital infrastructure around their worlds. This isn't necessarily a bad thing assuming you intended it that way, but it might be hard to balance with the current lab setup and the ease with which trade ports can be built for a massive influx of money. Combine this with the large amount of worlds available right now and space is looking massively crowded.
Volcanic worlds like Mercury can get 200 each of logistics and tactical slots, and I'm assuming that's a typo/bug.
The better thrusters researches are nice ideas, but it currently only applies to capitals. Using the mass reduction research modifier will produce the same result but for all vessels, and the displayed strings for that can be edited in English.str to say something like "Increased Thrust" instead of "Mass Reduction".
Rotating sections for ships can be made through attaching the rotating section to the mesh as a particle effect. I don't think you can attach mesh points to them though, so the Stiletto wouldn't be able to deploy fighters from its gravity centrifuge if you do include the Sol ships as 1st Gen designs.
Some more weapon variety would be nice, such as lasers and Gauss and railgun weapons. I doubt in 2210 we'll still be using chemical propellants for warship cannons, so even if you don't adjust weapon stats, it would be nice to see some sort of weapon type and particle change for them. Autocannons are very low-velocity weapons for space combat, and even the Sol ships in Nexus used Gauss technology, after all. 7 Deadly Sins has some custom bullet GFX for Gauss and railgun weapons and we'd be happy to share them if you wanted to use them, although our railgun effects are fairly large and really only suited for large-scale warship cannons.
I think your two cruisers should get access to Excaliburs, Thunderbolts, and Sabers as they're certainly large enough to each host 2-3 squadrons and it would be nice to be able to get some strikecraft support without needing to build a capital ship. I also wouldn't mind seeing destroyers get access to a single squadron with a choice of either Thunderbolts or Excaliburs.