In a medium bowl, mix together eggs, ricotta and feta. Stir in spinach mixture. Lay 1 sheet of filo in the baking dish and brush lightly with olive oil. Lay another sheet of filo on top, brush with olive oil and repeat process with two more sheets. The sheets will overlap the dish. Spread spinach and cheese mixture into the dish and fold the overhanging filo over the filling. Brush with oil, then layer the remaining 4 sheets, brushing each with oil. Tuck overhanging filo into the baking dish to seal the filling.