That's a nice drawing, but I'm not sure if I have the water flow correct in my head. The drain from the tank goes into the narrow compartment in the back, and some drains into the fuge, while some drains directly into the return area on the left. I guess that's the reason for the two "notches" in the wall that separates the drain area from the fuge and the return area. Then the water from the fuge goes through the bubble trap into the return area, while the water that bypasses the fuge has no bubble traps?

If I'm right on that description, I'd suggest modifying the flow a little so that all the water goes over a bubble trap. You can also split the drain so that some drains into the drain area, and some directly into the fuge. This is easy with a tee off the drain line and a ball valve on the fuge side.

Another suggestion would be to round off the interior walls that water will flow over; this seems to help with bubble dispersion.

Looks good!