Original sales materials: iw_31_brochure.zip
The giant to-do list is now here.
http://www.dba.dk/31-fods-havkrydser/id-72263946/ 
http://smhavn.dk/con24.php4 
http://iw31.blogspot.com 
http://www.stormy-iw31.eu/7572/ 
http://www.stormy-iw31.eu/5881/ 
http://www.iw31.de/bilder/index.html 
http://sy-juliette.de/ 
http://www.halse.de/ 
http://sparkmanstephens.blogspot.com/2011/02/design-1899-iw-31-class.html 
http://mermaidscheveningen.webklik.nl/page/ontwerp 
http://www.iw31-wismar.de/ 
http://www.iw31.dk/ 
http://www.iwrig.com/57718625 
http://eskapad.wordpress.com/ 
http://mermaidscheveningen.webklik.nl/page/ontwerp 
http://www.klassiekepolyesterjachten.nl/page/OverOns 
http://sailboatdata.com/viewrecord.asp?class_id=5505 
http://www.s-and-s-association.org/ 
http://www.sparkmanstephens.info/doc/5702458zUBmMLGktd9U2RAC4CT7yqTe9.pdf 
http://www.hinnerk-weiler.de/ 
http://www.youtube.com/hinnerkWeiler 
http://www.youtube.com/user/ottorino43 (commented on a video that he owns an IW 31) 
http://www.youtube.com/user/essen222 (commented on a video that he owns an IW 31) 
https://picasaweb.google.com/116970321897372292619/IW31Havskum# 
http://www.faaborg-vaerft.dk/Faaborg_Vaerft_A/S osmosis treatment in DK 
I'm not entirely certain I've put in the correct numbers for all the calculations correctly, but here are our general performance & stability numbers (from sailingcourse.com):