module for reference top plate without holes

maybe the tolerance could be tightened just a bit, but other than that,
seems like a pretty good start

src/components.scad

@@ -13,7 +13,7 @@
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
- * Foobar. If not, see <https://www.gnu.org/licenses/>. 
+ * bullet-system-stick. If not, see <https://www.gnu.org/licenses/>.
  */
 
 /* QUASI-CONSTANTS */
@@ -24,6 +24,7 @@ hole_tolerance = 0.25;
 // M4
 m4_bolt_radius = 2 + hole_tolerance;
 m4_bolt_countersink_radius = 6 + hole_tolerance;
+m4_bolt_hex_exterior = 3.5 + hole_tolerance;
 
 // 24mm button
 small_button_radius = 12 + hole_tolerance;
@@ -78,9 +79,13 @@ module levermountholes() {
 		m4_hole_countersink();
 }
 
+module base_topplate() {
+	cube([175,200,5], center=true);
+}
+
 module topplate() {
 	difference() {
-		cube([175,200,5], center=true);
+		base_topplate();
 		// holes for mount bolts
 		translate([77.5, 90, 0])
 			m4_hole();

src/top-left-panel.scad

@@ -13,10 +13,10 @@
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
- * Foobar. If not, see <https://www.gnu.org/licenses/>. 
+ * bullet-system-stick. If not, see <https://www.gnu.org/licenses/>.
  */
 
-use <components.scad>
+include <components.scad>
 
 // combine the lever mount and generic plate, with mounting holes
 module leverplate() {