For those of us that have too many helmets.
This base piece uses the bar and upper piece from the Galactic Armory wall mount, and replaces the base with a French Cleat bracket sized for a standard 2x4 with two 30-degree bevels.
½" PVC pipe works for the bar, I highly recommend buying it from the hardware store, though you could print out a tube if you wanted to.
The upper piece shown in the image is part of the Galactic Armory wall mount (NOT INCLUDED). I might design my own later and upload it.
The author marked this model as their own original creation.