Hi,
I didn't finish assembling my model yet. Remaining is: cockpit (will be made from scratch), flaps servo mounting, undercarriage hatch with door actuators. All electronics and fuel system to be installed in the fuselage.
I'm planning to bring all electronics as much forward as possible. Despite that I will need more then 1kg of ballast in the cowl to achieve correct CG. For sure there will be no any switches outside of the plane, removing cockpit is not big deal in this model.