I was going to report that I was done with all the painting until I realized that I still need to do the rear of the backdrop sections. But all visible wood has been done. It is just waiting to finish drying before I reattach the front wings onto the sides. The quick install was verified as I reinstalled the sides as a convenient place to put the dry-to-the-touch pieces while they finished curing.
Things are going slower than they might have because my attempts to replace the now used up 21 year-old! can of Behr flat black paint foundered on the twin rocks of the whole paint code and formulation system having changed during that period as well as Behr seeming to have stopped shipping quart cans of flat. Gallons and sample size you can have but not a quart. No idea why but I do know that a sample size is not enough and, given how long it took me to use up the last quart, a gallon is more than a lifetime supply.
The resolution was to get a quart of Glidden flat black instead. The colour matches but the sheen is not identical. Fortunately I arranged to finish whole sections with the old can so nothing has to be half and half.
Once I get it all done and post the final result shot I will be out of excuses for hanging the LED light strip and getting on with the scenery.