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In the game build UI's, click the Import button
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Now as noted in the Import dialogue, use the drop down Load Plan.
You will need to have purchased Blueprints for any modules used in the plan, from the various faction Representatives.
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.. And then there is no mention of actual construction plans.Construction Planning
The construction of a station requires some planning. It is only possible to plan stations using Blueprints that the player has already obtained (see below).