I built this Stevenson Screen a few months ago with a veiw to selling them. I had an original Casella Screen in kit form and put it on ebay and to my astonishment it reached over £200.
The kit was not unlike a giant box of matches - mainly the louvre slats. And seeing a new screen for sale at £495 - thought there might be a market, possibly only a small one. My screen is still on sale at on ebay for £250.