Upcoming film �Purampokku� is on the go with Aarya, Vijay Sethuathy, Karthika and Tamannah. The film is being directed by �Peranmai� fame S.P. Jananathan. Sources close to the movie team says a prison set is being designed in Chennai by �Madarasapattinam� art director, Selvakumar. Its estimated cost is around two crore rupees. Once the set is ready, the scene will be taken here by mid of April and will be a 40-days long shoot with all the four leading actors involved in the shot.