Historic Props   My skills in the carving and shaping of polystyrene along with my extensive knowledge of materials enables me to produce props ranging from full size celtic crosses to bronze age swords and helmets. I have made props for various uses in the past, including Tourist Information Offices, museums and shop windows. As a rough price guide to help you, the cost of a one off 9 feet tall celtic cross would be about £1,000. Whereas a reconstructed Sutton How Saxon helmet with a metallic finish and all the detailed relief on the surface would cost £500.