Make fields final if possible to ensure immutability

src/main/java/appeng/client/render/blocks/RenderBlockSkyChest.java

@@ -19,7 +19,7 @@ import appeng.tile.storage.TileSkyChest;
 public class RenderBlockSkyChest extends BaseBlockRender
 {
 
-	ModelChest model = new ModelChest();
+	final ModelChest model = new ModelChest();
 
 	public RenderBlockSkyChest() {
 		super( true, 80 );

src/main/java/appeng/client/render/blocks/RenderBlockSkyCompass.java

@@ -25,7 +25,7 @@ public class RenderBlockSkyCompass extends BaseBlockRender
 {
 
 	float r = 0;
-	ModelCompass model = new ModelCompass();
+	final ModelCompass model = new ModelCompass();
 
 	public RenderBlockSkyCompass() {
 		super( true, 80 );