little question about BHO

hey i was just wondering how much (approximately..) BHO i'd expect from all the leaves and other waste from a plant around this size. using a similar method to this:

http://www.a1b2c3.com/drugs/hash005.htm

throw in a guess at the yield of her as well if you want. just for shits n giggles (4 weeks into 12/12)

Also does anyone know if a mixture of butane/propane is suitable for the extraction.