I have to make 6 off 58" x 12" foot panelled shutters for a Georgian property for the inside of the windows. Shutters have to be 1" thick. Shutters will be painted when completed. Whats the best timber for the job? The windows get the sun from 4.30am in the morning so I need something that isn't going to warp and twist and is very stable which presumably means some PAR softwood from the likes of B&Q or Wickes will be out of the question