Customized Rounded Simple Name Fob

This is the 'next step' in design of a simple, customizable, name key fob, used as an introductory-level demonstration of OpenSCAD to community members, through the Let's Code Blacksburg organization.
(https://www.facebook.com/groups/letscodeblacksburg/)

This is intended to show the basic parameterization capabilities of OpenSCAD, and the Thingiverse Customizer, plus use of the minkowski() operation.

Using the Customizer, you can alter the dimensions of the fob body and the keychain loop, as well as the amount the keychain loop extends from the end of the fob. Additionally, you can change the text display, as well as the text font and the height/depth of the text (which can protrude above the face, or be inset into the face, depending on the sign of the height/depth parameter).

This 'next step' version also allows specifying the edge roundness of the fob, and the number of sides on the keychain loop. (So, shapes such as squares, hexagons, octagons, etc are possible for the lo