I have an older grape crusher, motor driven.

I plan on rebuilding the support braces and hopper.
I will salvage the hopper wood, probably make new braces from a
hardwood.
Either Oak or Maple. What ever is cheaper.

The "gears" that crush the grapes are cast iron. Although mostly rust
free I would like to paint them.
I plan on getting some Gondola Enamel (food-grade)
I am not sure if this will hold up from use.

Any suggestions?

The hopper looks like it is varnished (it is flaking off)
I plan on stripping this, looks like oak, and maybe mineral oil finish
or nothing at all.

Any suggestions?

I plan on re-wiring the motor (probably done in the 1960's or 70's)
Put a switch on it, ground circuit, maybe GFI?

Any suggestions?