My coturnix don't care for nestboxes or enclosures at all, but for my buttons I use an upended 1 litre plastic yogurt container (Sorry me no do non metric measurements. A family sized pack not a single serve punnet. It has sort of a tapering shape with a square top and bottom) with panels cut out of two adjacent sides that she can go in and out of. They sit with their heads facing the windows and their butts to the solid walls. They love them and they are easy to clean or just chuck out.