This is a full sized 19", 1U network or audio rack blank in three pieces, designed especially for the A1 Mini.

It is designed with a bit of thickness for strength and for good hold of the dovetail joints.

* It is very sturdy, but as it is currently, may require some sanding for the joints to fit; I found them to be a bit tight, but after some sanding, they fit very snug, and are strong. Also, as it is currently, the blank tends to be about a mm too high, so could use a half a mm cut off of both top and bottom as oriented on the rack (length is perfect). This is only an issue if spacing it between two devices.

I have included the .blend file of the uncut blank, so feel free to modify as needed, and is the perfect opportunity to shave that half mm off the top and bottom. This could also be extended to 2U or more, or be modified to hold Raspberry PIs.