I'm purging myself of a spare Korg Mono/Poly chassis / body / case that I swapped out for a solid walnut one. The synth itself has been modified (with a ModyPoly) anyway, so there's no value for me to keep them together.
Note that this was was swapped out because of the cosmetic tear/break in the particle board on the right side of the synth. I imagine it was probably broken after being dropped. Just wanted to point that out so you're aware—please see the close-up I took of this.
If you'd like to make new cases/chassis for a Korg Mono/Poly, this would be a great template to breakdown. :)