So basically you want to create a modal for each image right? Not necessary have them connected? I can give you pretty simple instructions if thats the case. I just built the same sort of thing on this page using dynamic content Manufacturer Directory - Canal Alarm Devices, Inc.
That tutorial is exactly what I did, so you should be good to go! Tip for when you are modifying or editing the lightbox: Set the dynamic list to limit items to 1, to see only one item while editing. Otherwise, you’ll see all your items simultaneously stacked on top of each other and the background will go black instead of transparent black. That can be confusing.