Doug,
there are units available, I kid you not, in sea containers, where you add say, any kid of oilseed, do the run, with a daily output of 70 gallons of diesel fuel......25k a piece.
i'm SURE you know more than I about biodiesel, but in a situation, I would be more than happy to amply compensate a consultant...serious.
but you are right, I would do the sawmill and still first.....keep the county drunks happy.