In my last update I talked briefly about what went right with the base. Now on to what went wrong. I made two major errors and a handful of small ones:

• (Major) The cutout for the thermal printer is 5mm too narrow.
• (Major) The elevated and tilted LCD holder hits the base.
• (Minor) LCD holder screws are 0.5mm too far apart.
• (Minor) The 2nd base piece warped a little.
• (Minor) There is no provision for securing the two base pieces on the right side.

Here's what the case looks like with the parts set in place (but no cables):

You can just see the left edge of the thermal printer overlapping the second base piece. In the next photo you can see the other major error: the LCD holder knocking into the base.

You can also see the Pi Zero in its place.

I still need to work on the base a bit. Mostly I'll be figuring out how to glue the base together, making everything fit well, and then any needed touch-ups. Overall I'm happy with it. Ponoko is a bit pricey for low volumes, and I would have likely been better of taking the dive of learning a real CAD program instead of using Inkscape.

[EDIT:] The .svg file has now been updated to correct the mistakes mentioned here.