Lots of ends, tops, and bottoms for the frames
First on the list was to build a jig for putting frames together. I built a couple the hard way one at a time and I could see this was going to get really boring very fast.
Fortunately there was an easy solution. I could still cut the notches for the sliding boards where they belonged and it might even look right to anyone but someone that knows what they are. Those people will see right off what I did and perhaps laugh a little later, but undoubtedly would be too polite to do so in front of me. At least now that I have a nail gun near by.
The two sliding boards temporarily hold the ends of the frames in place so the bottoms and tops can be added. I found that it goes a lot faster to hold one ends worth of the pieces together and apply the glue all at once, and then place them in the jig, as opposed to applying the glue once they are jigged up.
First glue & nail on the bottom boards.
Almost done a set of ten plus an extra. Flip the whole thing over and glue and staple on the top boards, remove the two sliding boards, & they come out of the jig.
I didn't get the last photo, but you get the idea.