Originally posted by Cyrien: You can build them faster by getting Temporal Space Yards 3.
Temporal Space Yards 3, on a population-maxed Sphereworld, with Advanced Storage Techniques (for the extra population), Hardy Industrialists, and +50% Construction Aptitude
(All that does cost 6000 racial points, though...so take a -50% penalty in Physical Strength and a -8% penalty in Political Savvy, and you're all set )
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Do it, or I'll do something mean & unexpected.