case.scad: remove the hardcoded PPBody() from helpers

src/case.scad

@@ -70,7 +70,7 @@ module _PeripheralCutouts(ButtonStyle) {
 module _FrontFace(tol=tol) {
   color("thistle")
   difference() {
-    translate([0, 0, -Thickness]) PPBody();
+    translate([0, 0, -Thickness]) children();
     _PhoneBulkLayer(tol=tol);
   };
 }
@@ -85,11 +85,11 @@ module _FrontKeep(tol=tol) {
     difference() {
       minkowski() {
         cylinder(r=2*tol, h=tol, center=true);
-        _FrontFace();
+        _FrontFace() children();
       };
       minkowski() {
         cylinder(r=tol, h=2*tol, center=true);
-        _FrontFace();
+        _FrontFace() children();
       };
     };
     // and expand it
@@ -103,8 +103,8 @@ module _FrontKeep(tol=tol) {
 /// the returned cutout is strictly z <= 0,
 module _FrontCutout() {
   difference() {
-    _FrontFace();
-    _FrontKeep();
+    _FrontFace() children();
+    _FrontKeep() children();
   };
 }
 
@@ -136,7 +136,7 @@ module Case(ButtonStyle="extrude")
         children(buttons);
       };
       // subtract the touchscreen area
-      translate([0, 0, tol]) _FrontCutout();
+      translate([0, 0, tol]) _FrontCutout() children(body);
     }
   }
 }
@@ -152,8 +152,8 @@ union() {
   };
 
   // debugging:
-  // _FrontFace();
-  // _FrontKeep();
-  // _FrontCutout();
-  // Phone();
+  // _FrontFace() PPBody();
+  // _FrontKeep() PPBody();
+  // _FrontCutout() PPBody();
+  // PPBody();
 }