CB Gallery

Does a more detailed document exist for the CB Gallery plugin beyond the Primer? Does the CB Gallery plugin allow me to create a module that presents a single random image, pulled from the various CB Galleries to be displayed on a Joomla content page outside of the CB pages? Even better if the random image could be selected relative to my existing CB categories (a retail business image vs. an artists work, vs. a restaurant). 

Does a more detailed document exist for the CB Gallery plugin beyond the Primer?

Unfortunately, no. I just don't have the time right now to write documentation.

Does the CB Gallery plugin allow me to create a module that presents a single random image, pulled from the various CB Galleries to be displayed on a Joomla content page outside of the CB pages?

Yes. The "Media" mode does exactly that. Lets you display media from any gallery source you like. It also supports searching, paging, and predefined sorting order (this includes Random). Example as follows.

 

This would show 4 random images from profile galleries.

Even better if the random image could be selected relative to my existing CB categories (a retail business image vs. an artists work, vs. a restaurant).

It doesn't have support for that, sorry. Might be doable at some point when CB Gallery has Tags then being able to display by Tag could probably work.