Cob: possible silly question

[nigella]

Hello all! I have a question that may be silly , nonetheless...
I was reading last night and came across something about the plaster used
after the cob is bulit.
 I like the idea of earth based plaster and read that you could sieve the
same ingredients as you used for the cob and make plaster from it. It also
mentioned that seiving the straw is difficult. Here's my question (please
don't laugh :)
Providing you have electricity couldn't you just pick up a few yard sale
blenders and give the straw a whir? What even caused me to think of this is
my soapmaking. I grind the herbs to make soap why not grind straw?
nigella