diff --git a/src/components.scad b/src/components.scad
new file mode 100644
index 0000000..1bbaf34
--- /dev/null
+++ b/src/components.scad
@@ -0,0 +1,103 @@
+/* Copyright Brian Stephan 2023
+ *
+ * This file is part of bullet-system-stick.
+ *
+ * bullet-system-stick is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * bullet-system-stick is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * 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/>. 
+ */
+
+/* QUASI-CONSTANTS */
+
+// adjustments
+hole_tolerance = 0.25;
+
+// M4
+m4_bolt_radius = 2 + hole_tolerance;
+m4_bolt_countersink_radius = 6 + hole_tolerance;
+
+// 24mm button
+small_button_radius = 12 + hole_tolerance;
+
+/* PARTS */
+
+module m4_hole() {
+	cylinder(r=m4_bolt_radius, h=100, $fn=50, center=true);
+}
+
+module m4_hole_countersink() {
+	cylinder(r1=m4_bolt_radius, r2=m4_bolt_countersink_radius, h=3.1, $fn=50, center=true);
+}
+
+module button_24mm_hole() {
+	cylinder(r=small_button_radius, h=100, $fn=50, center=true);
+}
+
+/* PIECES */
+
+module levermountbase() {
+	difference() {
+		// base plate
+		cube([53,95,3], center=true);
+		// joystick hole
+		cylinder(r=21, h=3.1, $fn=50, center=true);
+	}
+}
+
+// see https://www.slagcoin.com/joystick/mounting_layering.html
+// should work with JLF, JLW, LS-32, LS-33, LS-40, LS-55, LS-56
+module levermountholes() {
+	// joystick hole
+	cylinder(r=12, h=5.1, $fn=50, center=true);
+	// holes for joystick bolts
+	translate([20, 42.5, 0])
+		m4_hole();
+	translate([20, -42.5, 0])
+		m4_hole();
+	translate([-20, 42.5, 0])
+		m4_hole();
+	translate([-20, -42.5, 0])
+		m4_hole();
+	// holes for joystick bolt countersinks
+	translate([20, 42.5, 2])
+		m4_hole_countersink();
+	translate([20, -42.5, 2])
+		m4_hole_countersink();
+	translate([-20, 42.5, 2])
+		m4_hole_countersink();
+	translate([-20, -42.5, 2])
+		m4_hole_countersink();
+}
+
+module topplate() {
+	difference() {
+		cube([175,200,5], center=true);
+		// holes for mount bolts
+		translate([77.5, 90, 0])
+			m4_hole();
+		translate([77.5, -90, 0])
+			m4_hole();
+		translate([-77.5, 90, 0])
+			m4_hole();
+		translate([-77.5, -90, 0])
+			m4_hole();
+		// holes for mount bolt countersinks
+		translate([77.5, 90, 2])
+			m4_hole_countersink();
+		translate([77.5, -90, 2])
+			m4_hole_countersink();
+		translate([-77.5, 90, 2])
+			m4_hole_countersink();
+		translate([-77.5, -90, 2])
+			m4_hole_countersink();
+	}
+}
diff --git a/src/top-left-panel.scad b/src/top-left-panel.scad
new file mode 100644
index 0000000..bb48f96
--- /dev/null
+++ b/src/top-left-panel.scad
@@ -0,0 +1,41 @@
+/* Copyright Brian Stephan 2023
+ *
+ * This file is part of bullet-system-stick.
+ *
+ * bullet-system-stick is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * bullet-system-stick is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * 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/>. 
+ */
+
+use <components.scad>
+
+// combine the lever mount and generic plate, with mounting holes
+module leverplate() {
+	difference() {
+		// base plate
+		union() {
+			translate([20,-20,0])
+				topplate();
+			translate([0,0,-4])
+				levermountbase();
+		}
+		// holes to mount the lever
+		levermountholes();
+	}
+}
+
+// put a 24mm hole in the lever plate just as a test
+difference() {
+	leverplate();
+	translate([70,0,0])
+		button_24mm_hole();
+}