I m planning on building a greenhouse out of old windows,
window are all approximately 34 x 34 and I m looking at about 7 feet by 12 feet for size, it will be elevated off the ground slightly and all advice is welcome
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Here's a link on how to do it - good luck with your project, I hope you'll share it with us!
http://www.instructables.com/id/Greenhouse-From-Old-Windows/
I saw a description of such a project. A woman had built a greenhouse, she said she accumulated many more windows than she needed, they were all different sizes, from the dimensions you have given it appears you will need different sized windows also.