Plastic Board

http://www.ecosheet.com/ http://www.remarkablesmile.co.uk/gallery.html http://www.solwayrecycling.co.uk/recycled-shop/farmers/stokbord

WikiHouse team wants to develop an open source alternative to the board.

The other thing is that having sorted out our community sharing space a bit with some google groups, some dev / sharing is really accelerating, especially on software. Would love you to join one or all of those groups if you're interested to, as the conversation is shifting into them? I'll invite you, or you can join via www.wikihouse.cc.