I don't think star bases are treated the same as spaceports. The best I can recall, Construction ships will go to the nearest spaceport to load up supplies.
I haven't played with gravity wells yet. Does the well for the system you are working with extend beyond the outermost planet/moon where you could build a spaceport?
The range of the well directly varies by ship size - larger ships will see the gravity well effect extend further out than smaller ones.
Being on the large size earlier in the game, constructors spend quite a bit of time at sunlight speeds until you get good enough tech to being the weight down. It's a fun mechanic since it makes techs like the Star Burner and efficient engines more valuable, and it incentivises designing the most efficient freighters you can for size/cargo/speed.
They also make setting up defenses a lot more interesting. A defensive fleet that jumps down a well after some raiders has a much better chance of catching them before they get far enough out to jump away, but that fleet won't be available to respond to other raids until they climb out of the well themselves.
Roger Bacon clued me in on how to adjust the gravity well effect based on the hyperdrive equipment used, and I took his advice and made the basic warp bubble less gravity well intense. That makes early game development of nearby systems manageable, and produces another design decision since the hyperdrive goes back to the larger well to get a longer range, while the warp bubble gets you to close systems better but is slower and consumes too much fuel to go very far.
Meanwhile, my other question remains, and just gets worse. I tried the options/settings and put every default on "engage system targets." In the selection window for my fleet it says "Posture" says "Attack any targets" and at the top I have (No mission) (Engage system targets). I based the fleet at the station on the planet where I know the Kaltors are going to appear. The Kaltors appear...and eat the station. The fleet doesn't respond until the Kaltors move on to trying to eat them for dessert.
When I started playing I pretty much squashed everything that even looked like automation because I wanted to learn stuff, but now I'm trying to learn how to automate stuff. I'm thinking that maybe somewhere along the line I shut something down that I need to turn back on to make fleet automation even work...or at least make it work with space monsters. I haven't had any pirates happen through since I made the adjustments, so I'm not sure the fleet would respond to them either.
EDIT: Okay, this question is resolved...or perhaps more accurately, withdrawn. I have learned, through rigorous experimentation, that my understanding was flawed. I was watching for the fleet to change their mission. They don't. Ever. But they do respond to the threat. I was just accustomed to seeing "Attack giant Kaltor" as the mission, and expected to be able to see the automation assign the mission just like I would see it when I assigned it myself.
< Message edited by Timsup2nothin -- 1/17/2019 7:14:17 PM >