The reason I wanted to post, was I saw an amazing video on how to Build a
cheap and easy green house, using irrigation tubing and Rio or star pickets.
Its really worth a look if your cash strapped and want to make a giant
greenhouse to protect your plants.
I hope I have the right link: Protecting the vegie plot.
http://www.abc.net.au/gardening/video/video_index_October2009.htm
I found the video but I wouldn't call that structure a greenhouse (which I
was hoping it would be). I suppose it could be adapted somehow.