diff --git a/src/Tgstation.Server.Host/Models/TransformerBase{TInput,TOutput}.cs b/src/Tgstation.Server.Host/Models/TransformerBase{TInput,TOutput}.cs
index 1da0c09d9e..73295f68ef 100644
--- a/src/Tgstation.Server.Host/Models/TransformerBase{TInput,TOutput}.cs
+++ b/src/Tgstation.Server.Host/Models/TransformerBase{TInput,TOutput}.cs
@@ -123,7 +123,6 @@ namespace Tgstation.Server.Host.Models
 				notNullExpression1,
 				subOutput1Expression,
 				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput1)));
-
 			var conditionalSubOutput2Expression = global::System.Linq.Expressions.Expression.Condition(
 				notNullExpression2,
 				subOutput2Expression,
@@ -172,7 +171,54 @@ namespace Tgstation.Server.Host.Models
 			where TTransformer2 : ITransformer<TSubInput2, TSubOutput2>, new()
 			where TTransformer3 : ITransformer<TSubInput3, TSubOutput3>, new()
 		{
-			throw new NotImplementedException();
+			var subTransformer1 = new TTransformer1();
+			var subTransformer2 = new TTransformer2();
+			var subTransformer3 = new TTransformer3();
+
+			var primaryInput = global::System.Linq.Expressions.Expression.Parameter(typeof(TInput), "input");
+
+			var subInput1Expression = global::System.Linq.Expressions.Expression.Invoke(subInput1SelectionExpression, primaryInput);
+			var subInput2Expression = global::System.Linq.Expressions.Expression.Invoke(subInput2SelectionExpression, primaryInput);
+			var subInput3Expression = global::System.Linq.Expressions.Expression.Invoke(subInput3SelectionExpression, primaryInput);
+
+			var notNullExpression1 = global::System.Linq.Expressions.Expression.MakeBinary(
+				ExpressionType.NotEqual,
+				subInput1Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput1)));
+			var notNullExpression2 = global::System.Linq.Expressions.Expression.MakeBinary(
+				ExpressionType.NotEqual,
+				subInput2Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput2)));
+			var notNullExpression3 = global::System.Linq.Expressions.Expression.MakeBinary(
+				ExpressionType.NotEqual,
+				subInput3Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput3)));
+
+			var subOutput1Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer1.Expression, subInput1Expression);
+			var subOutput2Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer2.Expression, subInput2Expression);
+			var subOutput3Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer3.Expression, subInput3Expression);
+
+			var conditionalSubOutput1Expression = global::System.Linq.Expressions.Expression.Condition(
+				notNullExpression1,
+				subOutput1Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput1)));
+			var conditionalSubOutput2Expression = global::System.Linq.Expressions.Expression.Condition(
+				notNullExpression2,
+				subOutput2Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput2)));
+			var conditionalSubOutput3Expression = global::System.Linq.Expressions.Expression.Condition(
+				notNullExpression3,
+				subOutput3Expression,
+				global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput3)));
+
+			var outputExpression = global::System.Linq.Expressions.Expression.Invoke(
+				transformerExpression,
+				primaryInput,
+				conditionalSubOutput1Expression,
+				conditionalSubOutput2Expression,
+				conditionalSubOutput3Expression);
+
+			return global::System.Linq.Expressions.Expression.Lambda<Func<TInput, TOutput>>(outputExpression, primaryInput);
 		}
 
 		/// <summary>