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.

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!