Functional GUI!

Content.Shared/GameObjects/Components/Items/SharedHandsComponent.cs

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+using SS14.Shared.GameObjects;
+using System;
+using System.Collections.Generic;
+
+namespace Content.Shared.GameObjects
+{
+    public abstract class SharedHandsComponent : Component
+    {
+        public sealed override string Name => "Hands";
+        public sealed override uint? NetID => ContentNetIDs.HANDS;
+        public sealed override Type StateType => typeof(HandsComponentState);
+    }
+
+    // The IDs of the items get synced over the network.
+    [Serializable]
+    public class HandsComponentState : ComponentState
+    {
+        public readonly Dictionary<string, int> Hands;
+        public readonly string ActiveIndex;
+
+        public HandsComponentState(Dictionary<string, int> hands, string activeIndex) : base(ContentNetIDs.HANDS)
+        {
+            Hands = hands;
+            ActiveIndex = activeIndex;
+        }
+    }
+}