There are various straight and corner pieces for walls for all factions, as well as selection pictures and tooltips. Presumably, the walls would be built using the removed line build feature, which allowed the player to build buildings along a straight line. Each faction has a specific type of wall; according to the tooltips which are left in the game, they were as follows:
Graph IRI | Count |
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http://dbkwik.webdatacommons.org | 4 |