diff --git a/avr/devices/n28/enclosure.scad b/avr/devices/n28/enclosure.scad
index 72ed69c..aabebff 100644
--- a/avr/devices/n28/enclosure.scad
+++ b/avr/devices/n28/enclosure.scad
@@ -12,7 +12,11 @@ post_height = 0;
 hole_diameter = 3;
 lid_thickness = 1.9;
 lid_lip = 1 ;
-lid_tolerance = .5;
+lid_tolerance = .25;
+
+hook_thickness = 0.75;
+hook_tolerance = .25;
+
 
 
 module posts(x, y, z, h, r){
@@ -30,7 +34,6 @@ module posts(x, y, z, h, r){
 }
 
 
-
 difference() {
     // box
     hull() {
@@ -98,8 +101,67 @@ difference() {
     translate([(width/2), -7, wall_thickness+2+6])
         cube([5, 10, 7], center=true);
 
+    translate([0, -9, -wall_thickness])
+      cylinder(r = 5.5/2, h = 6);
+
+
+    // slits for hooks
+    // upward facing side
+    translate([-((width/2)-(wall_thickness/2)), length/8, (height-lid_thickness)+1])
+        cube([3, 6, hook_thickness+hook_tolerance], center=true);
+    translate([-((width/2)-(wall_thickness/2)), -length/8, (height-lid_thickness)+1])
+        cube([3, 6, hook_thickness+hook_tolerance], center=true);
+
+    // downward facing side
+    translate([(width/2)-(wall_thickness/2), 0, (height-lid_thickness)+1])
+        cube([3, 6, hook_thickness+hook_tolerance], center=true);
+     translate([(width/2)-(wall_thickness/2), length/4, (height-lid_thickness)+1])
+        cube([3, 6, hook_thickness+hook_tolerance], center=true);
+    translate([(width/2)-(wall_thickness/2), -length/4, (height-lid_thickness)+1])
+        cube([3, 6, hook_thickness+hook_tolerance], center=true);
+
 }
 
+/* lid */
+translate([0, 0, 40]) {
+  difference() {
+    union() {
+        hull() {
+            posts(
+                  x=(width/2 - corner_radius - lid_lip - lid_tolerance), 
+                  y=(length/2 - corner_radius - lid_lip - lid_tolerance),
+                  z=0,
+                  h=lid_thickness+1.0,
+                  r=corner_radius);
+        }
+        
+        // upward facing side
+        translate([-((width/2)-lid_lip), length/8, 1])
+            cube([2, 5, hook_thickness], center=true);
+        translate([-((width/2)-lid_lip), -length/8, 1])
+            cube([2, 5, hook_thickness], center=true);
+    
+        // downward facing side
+        translate([(width/2)-lid_lip, 0, 1])
+            cube([2, 5, hook_thickness], center=true);
+         translate([(width/2)-lid_lip, length/4, 1])
+            cube([2, 5, hook_thickness], center=true);
+        translate([(width/2)-lid_lip, -length/4, 1])
+            cube([2, 5, hook_thickness], center=true);
+    
+      }
+
+    // drilling holes    
+    translate([0, (length/8), -lid_thickness])
+      cylinder(r = hole_diameter, h = 6);
+
+    translate([0, -(length/8), -lid_thickness])
+      cylinder(r = hole_diameter, h = 6);
+      
+ }
+}
+
+
 
 // support posts for pcb
 /*difference() {