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Bioethanol from Wheat Straw?

Wheat straw is a very cheap source of carbon that could be transformed (by microbial means) to ethanol. What are the major obstacles faced in the large-scale production of bioethanol from wheat straw? And also, which of the 3 production steps (Pretreatment, Saccharification, Fermentation) is the most costly one?

Actually, biomethanol is better, it doesn't require sugars because it uses an anaerobic process instead of the aerobic process that requires high value feedstocks. Why not use wheat grass or prarie grass instead? And WHY use large scale systems? This would be a GREAT family farm product.

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