The rest of the 96 ribs were cut and finished, at right. The rejects are under the table, kept around in case they're needed for something else.
Next was cutting the drum frames, starting with the basic discs:
I call this picture "Using tools to make tools to make parts to make a filter". Making a router fixture to cut the rib notches in the frames.
Then the centers were cut out:
This gives a rough idea of how it assembles. I was just screwing around here and not worrying about alignment. The nice thing is that the ribs are a really tight fit in the slots such that the entire affair is self-jigging. When the first 8 ribs were installed, the assembly was really "floppy". Adding the next 8 helped a lot, and with all 96 it may be stiff enough to not need diagonal bracing, but we'll see. I already have a solution in mind in case that's needed, really simple and inexpensive.
Here the bits are being placed to construct the assembly. All ribs will be installed before being plastic welded: