In the meantime...I got this really cool little table on Amazon (it telescopes from 23" to 46") for the DCC equipment so it's not struggling for a few inches of space on the banquet table. It folds down nice and small.

The missing corner module is in my workshop. It was the first one I ever built, so the track connection on one end wasn't great--would leave a bit of a gap--so I soaked the track and ballast with alcohol, relocated the track and checked both ends with a double track plate, and then re-ballasted everything. It's drying now with a fan.