diff --git a/main.scad b/main.scad
index cc13774..1bd9ceb 100644
--- a/main.scad
+++ b/main.scad
@@ -15,18 +15,20 @@ XRAY_BOTTOM=3;
 // EXPORT:
 MODEL_HARNESS_LEFT=1;
 MODEL_HARNESS_RIGHT=2;
-MODEL_HARNESS_BOTTOM_PIP=3;
-MODEL_HARNESS_TOP=4;
-MODEL_HARNESS_SLIDER_FRONT=5;
-MODEL_HARNESS_SLIDER_BACK=6;
-MODEL_HARNESS_BUTTONS=7;
-export=0; // [0:7]
+MODEL_HARNESS_BOTTOM=3;
+MODEL_HARNESS_BOTTOM_PIP=4;
+MODEL_HARNESS_TOP=5;
+MODEL_HARNESS_SLIDER_FRONT=6;
+MODEL_HARNESS_SLIDER_BACK=7;
+MODEL_HARNESS_BUTTONS=8;
+export=3; // [0:8]
 function is_not_export() = is_undef(export) || export == 0;
 function is_export() = !is_not_export();
 function is_model_strict(m) = is_export() && export == m;
 function is_model(m) = is_not_export() || export == m;
 
 function get_phone_size() = [160, 76.7, 10];
+function use_slideout_backplane() = !is_model_strict(MODEL_HARNESS_BOTTOM_PIP);
 
 backplane_pip_slideout=10;
 
@@ -38,6 +40,20 @@ module cubi(s, fillet=0, edges=EDGES_ALL) {
     }
 }
 
+module dotted_grill_cutout(vents_area, vents_x=10, vents_y=10, mesh=1.5, cut_corners=false) {
+    function is_corner(x, y, xm, ym) = (x == 0 || x == xm) && (y == 0 || y == ym);
+    vent_size=[vents_area.x/vents_x-mesh, vents_area.y/vents_y-mesh, vents_area.z];
+    translate([-vents_area.x/2 - vent_size.x/2, vents_area.y/2 - vent_size.y/2, 0])
+    for (x=[0:vents_x-1]) {
+        for (y=[0:vents_y-1]) {
+            if (!cut_corners || !is_corner(x, y, vents_x-1, vents_y-1)) {
+                right(x*(vent_size.x+mesh))
+                fwd(y*(vent_size.y+mesh))
+                cubi(vent_size, fillet=min(vent_size.x/2, vent_size.y/2));
+            }
+        }
+    }
+}
 module phone() {
     s=get_phone_size();
     color("gray")
@@ -132,24 +148,26 @@ module phone_harness() {
     }
     module shell_backplane(groove) {
         module groove_scale() { scale([groove?1.05:1, groove?1.05:1, groove?1.2:1]) children(); }
-        down(hs.z/2 - shell_wall/3) up(backplane_rim_size.z/2) right(harness_divider.x) {
-            back(backplane_rim_size.y/2) {
-                teeth=backplane_teeth;
-                segment=backplane_rim_size.y/teeth;
-                tooth_size=[backplane_rim_size.x, segment/2, backplane_rim_size.z];
-                joiner_base=5;
-                joiner_size=[joiner_base + (groove?backplane_pip_slideout:0), segment*1.5, backplane_rim_size.z];
-                for (i = [0:teeth-1]) {
-                    fwd(i*segment) fwd(tooth_size.y) {
-                        groove_scale() cubi(tooth_size, fillet=0.5, edges=EDGES_X_ALL);
-                        if (i%2 == 0) {
-                            left(backplane_rim_size.x/2 + joiner_base/2) fwd(joiner_size.y/3) left(-joiner_size.x/2) groove_scale() cubi(joiner_size, fillet=2, edges=EDGES_Z_ALL);
+        
+        if (use_slideout_backplane()) {
+            down(hs.z/2 - shell_wall/3) up(backplane_rim_size.z/2) right(harness_divider.x) {
+                back(backplane_rim_size.y/2) {
+                    teeth=backplane_teeth;
+                    segment=backplane_rim_size.y/teeth;
+                    tooth_size=[backplane_rim_size.x, segment/2, backplane_rim_size.z];
+                    joiner_base=5;
+                    joiner_size=[joiner_base + (groove?backplane_pip_slideout:0), segment*1.5, backplane_rim_size.z];
+                    for (i = [0:teeth-1]) {
+                        fwd(i*segment) fwd(tooth_size.y) {
+                            groove_scale() cubi(tooth_size, fillet=0.5, edges=EDGES_X_ALL);
+                            if (i%2 == 0) {
+                                left(backplane_rim_size.x/2 + joiner_base/2) fwd(joiner_size.y/3) left(-joiner_size.x/2) groove_scale() cubi(joiner_size, fillet=2, edges=EDGES_Z_ALL);
+                            }
                         }
                     }
                 }
             }
         }
-        
     }
     
     // ==== SHELL SLIDER AND RAIL ====
@@ -227,20 +245,22 @@ module phone_harness() {
     module bottom_speaker_cutout() {
         s=[8, 49, 100];
         left(ps.x/2 - 13)
-        difference() {
-            down(s.z/2 - ps.z/3) cubi(s, fillet=1);
-            bars=8;
-            down(ps.z/2)
-            for (i = [0:bars-1]) {
-                bs=[s.x+2, 1, 2];
-                step=s.y/bars;
-                fwd(i*step - s.y/2 + step/2) down(w) cube(bs, center=true);
-            }
-        }
+        down(s.z/2 - ps.z/3)
+        dotted_grill_cutout(s, vents_x=4, vents_y=8, cut_corners=true, mesh=1);
+    }
+    module bottom_vents_cutout() {
+        vents_x=10;
+        vents_y=6;
+        vents_area=[35, 50, 10];
+        vents_pos=[45, 0, -ps.z/2];
+        mesh=1.5;
+        translate(vents_pos)
+        dotted_grill_cutout(vents_area, vents_x=vents_x, vents_y=vents_y, mesh=mesh, cut_corners=true);
     }
     module bottom_cutout() {
         back_camera_cutout();
         bottom_speaker_cutout();
+        bottom_vents_cutout();
     }
     
     // -- RIGHT --
@@ -376,6 +396,10 @@ module phone_harness() {
     
     if (is_model(MODEL_HARNESS_LEFT)) model_harness_left();
     if (is_model(MODEL_HARNESS_RIGHT)) model_harness_right();
+    if (is_model_strict(MODEL_HARNESS_BOTTOM)) {
+        model_harness_left();
+        model_harness_right();
+    }
     if (is_model_strict(MODEL_HARNESS_BOTTOM_PIP)) {
         model_harness_left();
         right(backplane_pip_slideout) model_harness_right();