Juicer,
As are you, I am here in Fresno and kicking the tires on building a system. With the shop, room and equipment you describe, I would definitely build my own instead of buying.
As far as store bought models go, I have seen only one up and running here in Fresno. It is from this company http://homebiodiesel.com/processor/ but not the model pictured here. The one I have seen is a 40 gallon system.
Being semi-retired, I probably have more time than brains but biodiesel does pique my interest (along with other forms of alternate energy). My yearly usage is not huge and so the amount of money saved is of secondary interest to the principle of alternate energy.
Have you checked out the resources on the web such as the following?
Appleseed Plans; Crude but workable. http://www.biodieselcommunity.org/appleseedprocessor/
Construction plans for biodiesel plants. http://www.murphysmachines.com/
Other suppliers and plans sources. http://www.b100supply.com/Default.asp?Click=1&Redirected=Y http://www.utahbiodieselsupply.com/
I might be able to get you in to see the system mentioned above in use. Will ask this week-end and all he can say is no which is likely.
Would be interested in getting together with you to see if we might be in a good mutual aid type of situation.
R.S.