So here's an update. I'm 6 hours in. I control a lot of planets. I have an absurdly high AIP, mostly because with a 120 planet map I'm finding things a lot more spread out and haven't gotten really any AIP reducers (along with needing to take everything for the achievement, of course!).
Murdoch is going to be my chokepoint of doom. My first Spire City has just gone up here. It's got a Zenith mod fort, a fortress II, Millitary Command III, tons of turrets and such, a nice large minefield... oh and all the trader goodies under construction (OMD, Counter Spy, Black Hole Generator, Radar Jammer II, Armor Booster, Armor Inhibitor, and SuperFortress). The downside to this spot is that I have to clear the surrounding planets to grow the spire city, which means waves can't be declared against it. The upside is that it's going to be capable of surviving exos, CPAs, border aggression, and anything else the AI can throw at it. Which means that once it's fully online I can take my entire fleet and charge forward in whatever direction I'm going, allowing the fleet to handle the waves.
P8 on the map is the coprocessors, which are badly located. The SuperTerminal is up in the northeastern branch, which is where I'm going to go. That one also has lots of goodies, including some SCLs (desperately needed).
I had my first encounter with the miners. One on a planet I controlled (easily dealt with). Another on a planet next to Murdoch, which a Nuclear Eye. That was... interesting. Protector Starships to the rescue there, as they let me field a small fleet and survive to take out the golem.
The AI has Spire Stealth Battleships now, which is pretty unfortunate. Oh yeah, and it has an Artillery golem, which is very unfortunate. To counter that I used some of my nearby asteroids and whipped up some Spirecraft. Mostly Implosion Artillery & Siege Towers, with a couple of attritoners, and Ion Blaster II, and a couple of Rams hidden in my territory safely until I see the artillery golem. I didn't use any asteroid above Xampite yet, so I'm in good shape there.
My unlocks include Leech Starship III, Fighter/bomber/Missile Frigate III, Grav Turrets I & II, Area Mines, EMP Mines... I think that's it for now.
One problem I'm having with a mine defense this time is that because Murdoch is a central hub for the entire map, there is a TON of Astro Trains there. It seems like there's always one around that disables cloaking. That won't matter at all to the other defenses once I get them online, but it really hurts the mines. I don't know how to deal with that at this point.
I did learn to park my ships using rally points away from the wormholes, so the tractor trains stop picking them up. They do keep picking up gatlings though. Have a nearby nebula, so I'm hoping to get the Neinzul hull. With how many AI ships are being thrown at me, insanity inducers would be real handy.
I also desperately need a Factory IV and ASC, to take more advantage of all my unlocks. Both of those are in the direction I'm going, but so is a zillion rocketry corps launchers. I'm not 100% clear on how to deal with those if I'm just taking all the systems they're in. Will make life interesting I suppose.
Oh yeah, the devourer golem is parked on Murdoch and eating the roaming enclave spawns. Then the AI shows up, and it eats them too (and then eats more spawns). It's kind of goofy how long it's been there for, and I think it may spend a long time there.