I tried to test this, but it seems like the progression is not tied to tech advance after all... In other words, I couldn't make the gunships appear. : )
But I think maybe at 5-7 minute mark would be okay. In five minutes you can build 10 level 1 anti-air turrets, but you can use your Percivals and Commander as targets for the gunships, so I guess it should be okay. Maybe?
But yeah, your intention with the mod probably wasn't More Difficult Campaign, so I'm fine with the things as they are. The start of the second mission at least was difficult enough. : )
singbird
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