I checked, its LOD_1. So I renamed the model to LOD_1, attached it to the scene root. exported it as crusader_keep. Added my entry to the descr_items as:
Code:
type crusades_stronghold_keep
lod
max_distance 4000.0
model_rigid ../../bi/data/models_building/crusades_keep.cas
This generated a new descr_items.db and an item file. The item file is 373KB while the original exported cas file is 374KB. I then did my thing with the the descr_model_building.txt (same entry as above) added the name of the entry to my settlement plan and still a ctd.
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