I believe you ignored the value from the soymeal crop that would be available to sell to determine your actual crop cost for your biodiesel analysis.....I think the soymeal is  nearly the same dollar value as the BO after crushing.....although the market goes back and forth from meal shortages to BO shortages a bit
Do you think the soy meal will pay the capitol costs of the oil extraction and bio-diesel conversion processes? Plus blending and transportation costs.
at current prices a bushel of soybeans yields about $4.25  in soymeal value and about $2.50 in soyoil value