And here's the inside....
The machine was stored fully threaded and with fabric under the presserfoot. Thanks 'somebody'!
Here we are at last with it cleaned up at least 1/2 way. I took some Pledge Revitalizing Oil to the cabinet and a damp towel to the metal. (Not the machine itself.) I'll get some Car Wax for the machine as I'm told by a good friend, Osage Bluff Quilter, not to use household cleaners on it.
Last step is a belt.
And to answer anyone curious enough,
I Have used a treadle machine before.
Thank you, Grandma Hunter!