Be careful about the freezer you buy, most new freezers have the condenser coils in the sides, so you'll need a fair amount of free space around the freezer. If you can find one that has the coils on the back, that might be easier to work with.
Does the soda water need stainless shank and faucet? I
Absolutely, YES. Unless you like flakes of chrome in your soda. I speak from experience.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk