So I hear you like Production (to be a trait) :D

OpenRa.Game/Traits/Production.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.GameRules;
+
+namespace OpenRa.Game.Traits
+{
+	class Production : IProducer
+	{
+		public Production( Actor self ) { }
+
+		public virtual int2? CreationLocation( Actor self, UnitInfo producee )
+		{
+			return ( 1 / 24f * self.CenterLocation ).ToInt2();
+		}
+
+		public virtual int CreationFacing( Actor self, Actor newUnit )
+		{
+			if( newUnit.traits.Contains<Helicopter>() )
+				return 20;
+			return 128;
+		}
+
+		public bool Produce( Actor self, UnitInfo producee )
+		{
+			var location = CreationLocation( self, producee );
+			if( location == null || Game.UnitInfluence.GetUnitAt( location.Value ) != null )
+				return false;
+
+			var newUnit = new Actor( producee.Name, location.Value, self.Owner );
+			newUnit.traits.Get<Unit>().Facing = CreationFacing( self, newUnit ); ;
+
+			var rp = self.traits.GetOrDefault<RallyPoint>();
+			if( rp != null )
+			{
+				var mobile = newUnit.traits.GetOrDefault<Mobile>();
+				if( mobile != null )
+					newUnit.QueueActivity( new Traits.Activities.Move( rp.rallyPoint, 1 ) );
+
+				var heli = newUnit.traits.GetOrDefault<Helicopter>();
+				if( heli != null )
+					heli.targetLocation = rp.rallyPoint; // TODO: make Activity.Move work for helis.
+			}
+
+			Game.world.Add( newUnit );
+
+			if( self.traits.Contains<RenderWarFactory>() )
+				self.traits.Get<RenderWarFactory>().EjectUnit();
+
+			return true;
+		}
+	}
+
+	class ProductionSurround : Production
+	{
+		public ProductionSurround( Actor self ) : base( self ) { }
+
+		public override int2? CreationLocation( Actor self, UnitInfo producee )
+		{
+			return Game.FindAdjacentTile( self, producee.WaterBound ?
+			        UnitMovementType.Float : UnitMovementType.Wheel);	/* hackety hack */
+		}
+
+		public override int CreationFacing( Actor self, Actor newUnit )
+		{
+			return Util.GetFacing( newUnit.CenterLocation - self.CenterLocation, 128 );
+		}
+	}
+}