Hi 4space,
I don't think it's possible to remove the center stars. The idea behind the box is to give the center stars a specific place where they can stay without doing any harm. If you remove the box you only remove their "home". The center stars are part of your home and defined by the period of the house and the facing for your front door. They are energy and will exist as long as you live in this house.
But once you've boxed the center stars you should not be harmed by them.
Good luck,
Astrid
