diff --git a/src/kaleidoscope/device/ATmega32U4Keyboard.h b/src/kaleidoscope/device/ATmega32U4Keyboard.h
index b0d66fea..2f552440 100644
--- a/src/kaleidoscope/device/ATmega32U4Keyboard.h
+++ b/src/kaleidoscope/device/ATmega32U4Keyboard.h
@@ -17,7 +17,7 @@
 
 #pragma once
 
-#ifdef __AVR__
+#if defined(__AVR__) || defined(KALEIDOSCOPE_VIRTUAL_BUILD)
 
 #include <Arduino.h>
 #include "kaleidoscope/device/Base.h"
@@ -46,6 +46,7 @@ struct ATmega32U4KeyboardProps : kaleidoscope::device::BaseProps {
   typedef kaleidoscope::driver::storage::AVREEPROM<StorageProps> Storage;
 };
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 template <typename _DeviceProps>
 class ATmega32U4Keyboard : public kaleidoscope::device::Base<_DeviceProps> {
  public:
@@ -53,6 +54,10 @@ class ATmega32U4Keyboard : public kaleidoscope::device::Base<_DeviceProps> {
     return Serial;
   }
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+template <typename _DeviceProps>
+class ATmega32U4Keyboard;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 }
 }
diff --git a/src/kaleidoscope/device/keyboardio/Model01.cpp b/src/kaleidoscope/device/keyboardio/Model01.cpp
index b8d1124c..ae6ecb62 100644
--- a/src/kaleidoscope/device/keyboardio/Model01.cpp
+++ b/src/kaleidoscope/device/keyboardio/Model01.cpp
@@ -16,11 +16,13 @@
  */
 
 #ifdef ARDUINO_AVR_MODEL01
-#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 #include <Kaleidoscope.h>
+
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include <KeyboardioHID.h>
 #include <avr/wdt.h>
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 namespace kaleidoscope {
 namespace device {
@@ -28,6 +30,8 @@ namespace keyboardio {
 
 constexpr uint8_t Model01LEDDriverProps::key_led_map[] PROGMEM;
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+
 /********* Model01Hands *********/
 
 struct Model01Hands {
@@ -293,9 +297,9 @@ void Model01::enableHardwareTestMode() {
   KeyScanner::setKeyscanInterval(2);
 }
 
+#endif
+
 }
 }
 }
-
-#endif
 #endif
diff --git a/src/kaleidoscope/device/keyboardio/Model01.h b/src/kaleidoscope/device/keyboardio/Model01.h
index 37334359..ceac5c5d 100644
--- a/src/kaleidoscope/device/keyboardio/Model01.h
+++ b/src/kaleidoscope/device/keyboardio/Model01.h
@@ -21,15 +21,24 @@
 
 #include <Arduino.h>
 
-#include "Kaleidoscope-HIDAdaptor-KeyboardioHID.h"
-#include "KeyboardioScanner.h"
-
 #define CRGB(r,g,b) (cRGB){b, g, r}
 
+struct cRGB {
+  uint8_t b;
+  uint8_t g;
+  uint8_t r;
+};
+
+#include "kaleidoscope/device/ATmega32U4Keyboard.h"
+
 #include "kaleidoscope/driver/keyscanner/Base.h"
 #include "kaleidoscope/driver/led/Base.h"
+#include "Kaleidoscope-HIDAdaptor-KeyboardioHID.h"
 #include "kaleidoscope/driver/bootloader/avr/Caterina.h"
-#include "kaleidoscope/device/ATmega32U4Keyboard.h"
+
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+#include "KeyboardioScanner.h"
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 namespace kaleidoscope {
 namespace device {
@@ -45,6 +54,7 @@ struct Model01LEDDriverProps : public kaleidoscope::driver::led::BaseProps {
   };
 };
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class Model01LEDDriver : public kaleidoscope::driver::led::Base<Model01LEDDriverProps> {
  public:
   static void syncLeds();
@@ -57,11 +67,15 @@ class Model01LEDDriver : public kaleidoscope::driver::led::Base<Model01LEDDriver
  private:
   static bool isLEDChanged;
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+class Model01LEDDriver;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 struct Model01KeyScannerProps : public kaleidoscope::driver::keyscanner::BaseProps {
   KEYSCANNER_PROPS(4, 16);
 };
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class Model01KeyScanner : public kaleidoscope::driver::keyscanner::Base<Model01KeyScannerProps> {
  private:
   typedef Model01KeyScanner ThisType;
@@ -96,8 +110,11 @@ class Model01KeyScanner : public kaleidoscope::driver::keyscanner::Base<Model01K
   static void actOnHalfRow(byte row, byte colState, byte colPrevState, byte startPos);
   static void enableScannerPower();
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+class Model01KeyScanner;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
-struct Model01Props : kaleidoscope::device::ATmega32U4KeyboardProps {
+struct Model01Props : public kaleidoscope::device::ATmega32U4KeyboardProps {
   typedef Model01LEDDriverProps  LEDDriverProps;
   typedef Model01LEDDriver LEDDriver;
   typedef Model01KeyScannerProps KeyScannerProps;
@@ -105,6 +122,8 @@ struct Model01Props : kaleidoscope::device::ATmega32U4KeyboardProps {
   typedef kaleidoscope::driver::bootloader::avr::Caterina BootLoader;
 };
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+
 class Model01 : public kaleidoscope::device::ATmega32U4Keyboard<Model01Props> {
  public:
   static void setup();
@@ -112,8 +131,10 @@ class Model01 : public kaleidoscope::device::ATmega32U4Keyboard<Model01Props> {
   static void enableHardwareTestMode();
 };
 
-}
-}
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+
+} // namespace keyboardio
+} // namespace device
 
 EXPORT_DEVICE(kaleidoscope::device::keyboardio::Model01)
 
diff --git a/src/kaleidoscope/device/keyboardio/twi.c b/src/kaleidoscope/device/keyboardio/twi.c
index 38fe7e59..8b5416e0 100644
--- a/src/kaleidoscope/device/keyboardio/twi.c
+++ b/src/kaleidoscope/device/keyboardio/twi.c
@@ -18,7 +18,7 @@
   Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
 */
 
-#ifdef __AVR__
+#if defined(__AVR__) && !defined(KALEIDOSCOPE_VIRTUAL_BUILD)
 
 #define ENABLE_TWI_SLAVE_MODE 0
 
diff --git a/src/kaleidoscope/device/keyboardio/twi.h b/src/kaleidoscope/device/keyboardio/twi.h
index e3753519..5b22cc40 100644
--- a/src/kaleidoscope/device/keyboardio/twi.h
+++ b/src/kaleidoscope/device/keyboardio/twi.h
@@ -21,6 +21,8 @@
 #ifndef twi_h
 #define twi_h
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+
 #include <inttypes.h>
 
 //#define ATMEGA8
@@ -52,5 +54,6 @@ void twi_reply(uint8_t);
 void twi_stop(void);
 void twi_releaseBus(void);
 
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #endif
 #endif
diff --git a/src/kaleidoscope/driver/mcu/ATmega32U4.h b/src/kaleidoscope/driver/mcu/ATmega32U4.h
index ad31c5fb..2a15fafd 100644
--- a/src/kaleidoscope/driver/mcu/ATmega32U4.h
+++ b/src/kaleidoscope/driver/mcu/ATmega32U4.h
@@ -23,6 +23,7 @@ namespace kaleidoscope {
 namespace driver {
 namespace mcu {
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class ATmega32U4 : public kaleidoscope::driver::mcu::Base {
  public:
   void detachFromHost() {
@@ -62,6 +63,9 @@ class ATmega32U4 : public kaleidoscope::driver::mcu::Base {
 
   void setup() {}
 };
+#else
+typedef Base ATmega32U4;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 }
 }