A few notes on using the Ponoko case, based on my experience (YMMV):
1. Be careful with the outer diameter of your 20mm standoffs. They can interfere with case nuts and cause you to crack off the thin area that the case-screws go into. I always use Harwin brass/nickel standoffs from Mouser, and they were a tight fit here. I had to make sure that they were oriented a particular way, to give the nuts enough clearance.
2. I found it easiest to spray paint the case parts before removing them from the single piece of laser-cut acrylic. Tape off the cut areas, to ensure no bleed.
3. I know the BOM says 10mm standoffs, but I found that the Erthenvar jacks and 5K and 20K trimmers were tall enough that 12K worked better.