Hi Web Weaver
I'm very grateful for the detailed response, but - unless I'm reading it wrong - it doesn't answer my question. I designed the image in my question using this method, but I want to be able to do something extra: drop an image into one of the cells and crop/move it while the cell remains locked in place.
This functionality is available in Print Module, Layout Style<Single Image/Contact Sheet>. However the ability to move/add/adust cells is quite limited in this section of the module.