Let us start here, from square one. No, from Zero!

overlay/windows/fps.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "overlay/window.h"
+
+namespace overlay::windows {
+
+    class FPS : public Window {
+    public:
+
+        FPS(SpiceOverlay *overlay);
+
+        const ImVec2 initial_pos() override;
+        void build_content() override;
+    };
+}