^ Seems reasonable enough.
What occurred to me as a suggestion just a bit ago.
As we now have the ability to "halt" production of civilian shipping lines. A nice addition.
Perhaps instead of a halt we could set an upper limit on tonnage that the Civilians are allowed to operate, and of what type.
So I could allow them 100,000t worth of freighters, 30,000t of colony ships, and 0t of fuel harvesters.
From there they pick their designs and can build up to less than that number in tonnage. If I lower the number while I they have more tonnage, it remains at that level until ships begin needing to be scrapped, after they're back below the allotted tonnage, they're allowed to start making new ships again.