I have had a half a dozen or so of these 117 series machines, and in my opinion they're worth saving...the machine that is, I've not seen a table that bad and it would be scrapped if here.
Because of the finish, I have used degreasers to clean the machines, after removing what I am comfortable removing, has worked fine as long as I don't scrub too hard. You'll want to service the motor, not just changing the drive wheel, but they clean up pretty easily. The nose piece is held on with two bolts and is worth removing to clean up inside, takes some lining up with a needle when you put it back on before tightening it up.
Once you learn the trick to threading it's pretty easy, I learned using a White Rotary manual as White made these machines for Sears.
If you decide to part it out, please message me.