Wayne,
Mark (Try Flying) would be the better person to answer your question, he gave me the vacuum pump and lent me the control circuitry as well as a spare pump in case I had any problems during a session.
I looked at using the milking machine that I have but the startup current without a delay on closing the vacuum would be just too much and my two other vacuum pumps, while great for small jobs, are really too small for big hulls.