How-to Import and Use the Mangonel Model
By Debode\Deolrin

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Importing:

To import the model, you must open your map in the World Editor and access the Import Manager(F12). Then you must import, using the "Import File"(CTRL+I) option, the file "Mangonel.mdx" which is located in the "Models" folder in this archive. You may import "MangonelMissile.mdx" if you need a fitting projectile for the Mangonel. If you also need fitting icons for the model, import "BTNMangonel.blp" and "DISBTNMangonel.blp" and change their paths to "ReplaceableTextures\CommandButtons\BTNMangonel.blp" and "ReplaceableTextures\CommandButtonsDisabled\DISBTNMnagonel.blp". 

Implementing:

(Thanks to Olofmoleman and Newbwc3 for making the Trebuchet model and its "recommended fields", respectively, from whom I took most of the information and also learnt about how some of the fields in Object Editor work)

In order to properly use the Mangonel model, it is recommended to create a unit based on the Steam Tank and use the following following values(IMPORTANT: you must first set "Stats - Is a Building" to "True" before proceeding to setting the paths):

Art - Ground Texture: "Arcante Tower, Cannon Tower, Guard Tower, Farm, Scout Tower..."
Art - Icon - Game Interface: "ReplaceableTextures\CommandButtons\BTNMangonel.blp"(you must import the icon for this field to work, obviously)
Art - Model File - Extra Versions: "None"
Art - Projectile Impact - Z: 50.00
Art - Projectile Launch - Z: 163.75
Art - Selection Scale: 2.75
Art - Shadow Texture(Building): "Farm"
Art - Special: "Altar of Kings <Special>, Workshop <Special>, Arcane Sanctum <Special>..."
Combat - Acquistion Range: 800-1000(depending on range)
Combat - Attack 1 - Animated Backswing Point: 0.210
Combat - Attack 1 - Animated Damage Point: 0.210
Combat - Attack 1 - Area of Effect Targets: "Ground, Structure, Debris, Tree, Wall."
Combat - Attack 1 - Cooldown Time: 3.25
Combat - Attack 1 - Projectile Arc: 0.35
Combat - Attack 1 - Projectile Art: "war3mapImported\MangonelMissile.mdx"(you must import the missile model for this to work)
Combat - Attack 1 - Projectile Speed: 1000
Combat - Attack 1 - Range: 800-1000
Combat - Attack 1 - Targets Allowed: "Debris, Ground, Item, Structure, Tree, Wall, Ward."
Combat - Attack 1 - Weapon Type: "Artillery"
Combat - Minimum Attack Range: 300
Movement - Speed Base: 0
Movement - Turn Rate: 0.25
Pathing - Collision Size: 50
Pathing - Pathing Map: "Arcane Tower, Cannon Tower, Guard Tower, Farm, Scout Tower..."
Pathing - Placement Requires: "Buildable."
Sound - Construction: "BuildingConstructionLoop"(It is under "Ambient")
Sound - Movement: "CatapultMovement"
Sound - Unit Sound Set: "Catapult"
Text - Name: Mangonel
Text - Tooltip - Extended: Immobile siege weapon, effective against buildings and clusters of troops. |n|n|cffffcc00Attacks ground units.|r