Building Large Observatory Array in EVE Online

What it takes to make Large Observatory Array, straight from the game's own blueprint data: every material and how many of each. The calculator above prices that list at one region's orders and draws the whole chain as a graph.

What goes into one run of Large Observatory Array

1 unit per run
Material	Per run	Can be built too
Structure Construction Parts	10	yes - its own chain
Structure Hangar Array	10	yes - its own chain
Structure Storage Bay	10	yes - its own chain
Structure Repair Facility	10	yes - its own chain
Structure Docking Bay	10	yes - its own chain
Structure Medical Center	4	yes - its own chain
Structure Office Center	4	yes - its own chain
Structure Electromagnetic Sensor	40	yes - its own chain

Production runs in whole batches. One run of Large Observatory Array gives 1 unit, so asking for fewer than that still means one full run - the game has no half runs, and rounding down would quietly tell you to buy the missing pieces.

For what Large Observatory Array actually is - mass, volume, attributes and the description from the game - see its item page, and for what it trades at right now, its market page.