At the end of this text block:
Part : /BASE_PART
{
NameKey = "Parts/MachineGun"
IconNameKey = "Parts/MachineGunIcon"
IDString = mystique.machinegun // Part IDs must always be in the form of "author_name.part_name". If making your own mod, do not use "cosmoteer" as your author name, because it may conflict with future vanilla parts.
OtherIDs = [machine_gun]
EditorGroup = "Weapons"
DescriptionKey = "Parts/MachineGunDesc"
Cost = 1000
AIValue = 7
TypeCategories = [weapon, uses_ammo, is_crewed]
Size = [1, 2]
PhysicalRect = [0, 1, 1, 1]
SaveRect = &PhysicalRect
SelectionPriority = 1
SelectionTypeByRotation = true
SelectionTypeID = "cannons"
MaxHealth = 2000
InitialPenetrationResistance = 5
ProhibitAbove = 1
That "ProhibitAbove"