Summary

This is my first effort at making a 3D object. It was created from scratch.
I printed out the Airplane Shelf Bracket and decided to try to match it with something similar. I used Skylab as a centerpiece instead of an airplane.

Skylab was awesome... so it seemed it might look good as a matching shelf bracket to the airplane. I created the Skylab graphic in GIMP, and exported to SVG. Then I imported it into TinkerCad and built the bracket around it, using the same dimensions as the Airplane Shelf Bracket. It's not exactly the same but shows how you can execute some simple designs in TinkerCad in just a few minutes

Update: I figured out how to use OpenScad and added a version of the bracket that is based on the Airplane Shelf Bracket directly. It has the same holes and should look identical other than the Skylab SVG pasted in the middle. Used inkscape in a Docker instance on my Macintosh to convert the SVG to DXF so that I could import the skylab graphic into OpenScad. Used a difference function call in OpenScad to block out the airplane before exporting to STL.

The Lulzbot 6 I used was at a library so I was limited to a 3 hour print. For this reason I printed at the lowest quality / fastest speed. You can get the idea from the photo.