Well, I never tried it at 9V, and I have never had a Chorus before, but it sounds great to me!! It goes from nice and subtile, all the way into super weird territory.
The clear shaft pots are available at SmallBear, and Mouser (SB is way cheaper and has more available values). The Davies style clear knobs are also as SB, and the chicken head ones I found from a link in one of Brian's build reports and are available from Amplified Parts. I also had some tiny daughter boards made for mounting the LED in the pot shaft.