Prefab

The item has a base part and a data part.

Base part

struct kdop_item	See kDOP item. Flags I know about are: Bit 0: Is tunnel Bit 1: Custom semaphores Bit 2: No collision Bit 16: No boundary Bit 17: Hide in UI map Bit 18: Is state border Bit 21: No activation Bit 22: Left hand traffic Bit 24: Water reflection Bit 25: Is ferry entrance Bit 26: Ignore cut planes Bit 27: No AI vehicles Bit 29: Low poly vegetation Bit 30: No terrain shadows
token prefab_model	The unit name of the prefab.
token prefab_variant	The model variant.
u32 add_parts_count array_token add_parts	A list of enabled additional parts.
u32 node_count array_u64 node_uids	The UIDs of the nodes of this prefab. It's important that the amount, position and rotation of nodes in the map matches the nodes of the prefab model. The origin node is always node 0 in this list, no matter which one it is, and you go around clockwise after that (I think).
u32 slave_count array_u64 slave_uids	Item UIDs of slave items of this prefab. These items are tied to certain spawnpoint types of the prefab model, such as trailer unload points and garage buy points. Slave item types in the game are: Bus Stop, Company, Fuel Pump, Garage, and Service. Again, it is important that the position of these items in the map matches the prefab model.
u64 ferry_link_uid	Links to a Ferry item if the prefab is a ferry.
s16 origin_idx	Defines which node is the origin (=red) node. This number is an index for the ppd file, not the node list above.
array_struct node_infos	Repeated for each node: token ter_profile float ter_profile_coef Terrain profile and coefficient for the terrain assigned to this node.
token semaphore_profile	Semaphore profile for this prefab.

Data part

token prefab_look	The model look.
array_struct node_infos	One per node. See Prefab node struct.
u32 vegetation_part_count array_struct vegetation_parts	List of vegetation parts.
u32 rnd_seed	The seed used for placing vegetation.
u32 veg_sphere_count array_struct veg_spheres	See Vegetation sphere struct.
array_struct corners	Corner models: token corner_model token corner_variant token corner_look Repeated 4 times, regardless of how many nodes or corners the prefab has.
array_struct quads	Terrain data. See Quad info struct.