I got it to create on only 1 side of each hemi-Lister - like in "A" below -
how can I specify WHICH side of each Lister like in "B" below?
Here's the final look I'm after - only 1 set of buttons on each side of the Lister,
but configure the buttons so they're BOTH on the "inside" of the layout - like in B (Photoshopped) :