Evil and Chaos wrote:
So you have a maximum of 3 Defence Installations per game, regardless of game size?
...I dislike that.
Well, no. There is at most only 3 Critical Installations, yes. But you can have as many Air Defence sites as you like (within Support formation restrictions). I've added the option for them to take curtain walls too; It should now be possible to set up a complete Hadrians Wall deployment, should one be so inclined.
Version 0.4 attached; Added a Missile Silo too; So you can now have a Missile Silo and a Defence Laser, to portray (a section of) Port Alpha...
Evil and Chaos wrote:
And yeah, any thought about removing all the surrounding fortresses, air defence sites etc?
No, I think they are key to making the installations work as formations - they provide numbers to the formation to prevent them easily breaking, and collecting the static elements in "operational" formations also lets them use the normal activation framework, with the usual tradeoffs - too small outposts are quickly suppressed and breaks easily, too large fortresses are too expensive, and can't spread fire over multiple targets.
We should perhaps try looking at possible armies? Some "sunshine" armies that portray the aspects of the defense that we're after, as well as some abusive armies that tries to break the list. I'll go first

Defence Installation: Orbital Defence Laser, 3x Air Defence Bastion, 5x Interceptor Guns, 15x Curtain Walls, Tech Lord [650]
Skitarii Demi-Century, 2x Praetorians [375]
Skitarii Demi-Century, 2x Praetorians [375]
Ordinatus Minorus, 2x QC, CLP [550]
Ordinatus Minorus, 3x Plasma [475]
Air Defense Site: 3x Air Defence Bastion, 10x Curtain Wall [250]
Air Defense Site: 2x Air Defence Bastion, 10x Curtain Wall [250]
Light Artillery Battery (Mole Mortars) [150]
How about it?