Animating cubical perspective in flutter - flutter

Question

I'm trying to implement the cubical swipe as outlined by Marcin Szalek in his Flutter talk for the different pages in my app. I was able to implement it for the left side, as he had shown. But if I want to implement it for the right hand side of the main page, or if I want to add a Gesture detector for another action, how can I stack these GDs on top of one another, if at all possible? Or should I restrict the GDs to certain sections of the screen? Thanks in advance.
GestureDetector(
onHorizontalDragStart: _onDragStart,
onHorizontalDragUpdate: _onDragUpdate,
onHorizontalDragEnd: _onDragEnd,
behavior: HitTestBehavior.translucent,
onTap: toggle,
child: AnimatedBuilder(
animation: animationController,
builder: (context, _) {
return Material(
color: Colors.black,
child: Stack(
children: <Widget>[
Transform.translate(
offset: Offset(maxSlide * (animationController.value - 1), 0),
child: Transform(
transform: Matrix4.identity()
..setEntry(3, 2, 0.001)
..rotateY(math.pi / 2 * (1 - animationController.value)),
alignment: Alignment.centerRight,
child: SettingsDrawer(),
),
),
Transform.translate(
offset: Offset(maxSlide * animationController.value, 0),
child: Transform(
transform: Matrix4.identity()
..setEntry(3, 2, 0.001)
..rotateY(-math.pi * animationController.value / 2),
alignment: Alignment.centerLeft,
child: widget.child,
),
),
],
),
);
},
),
),
]);
}
void _onDragStart(DragStartDetails details) {
bool isDragOpenFromLeft = animationController.isDismissed;
bool isDragCloseFromRight = animationController.isCompleted;
_canBeDragged = isDragOpenFromLeft || isDragCloseFromRight;
}
void _onDragUpdate(DragUpdateDetails details) {
if (_canBeDragged) {
double delta = details.primaryDelta / maxSlide;
animationController.value += delta;
}
}
void _onDragEnd(DragEndDetails details) {
//I have no idea what it means, copied from Drawer
double _kMinFlingVelocity = 365.0;
if (animationController.isDismissed || animationController.isCompleted) {
return;
}
if (details.velocity.pixelsPerSecond.dx.abs() >= _kMinFlingVelocity) {
double visualVelocity = details.velocity.pixelsPerSecond.dx /
MediaQuery.of(context).size.width;
animationController.fling(velocity: visualVelocity);
} else if (animationController.value < 0.5) {
animationController.reverse();
} else {
animationController.forward();
}
}