[Suicide Junkie]

How about finely dedicated construction facilities?
- The facility decription & abilities restrict it to producing only a short list of items.
- The facility builds at a slow and steady rate, but also gains a big discount on build costs, perhaps even free in some cases.

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For example, you could build an infantry barracks.
It would let you build 2 light infantry, or 1 heavy infantry per turn, at no cost.

When you research Light Cruisers, you could open up an "Escort AutoYard"
It would allow you to build escort hulls at a discount of 25% on materials, and 50% on labour.

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Best for units, surely.
Especially with auto-launch options, you could have facilities for auto-building mines, sats and fighters too.