The palette units worked great. I was pleased as punch for hanging over a dozen paintings without hammering a bunch of nails. The solution was to pre-mount all the little plein aires onto a palette-like frame. The show was hung using 2 pre-existing nails and adding one of my own. There was no way the owners would have let me put the show up otherwise.
With this tight acrylic-on-masonite-on-palette unit, I can fit it into virtually any coffeeshop, tasting room or reception area; basically anywhere people can take a gander. Who wants it next?