I'm not sure if I have mentioned this before but the larger, zoomed in squares will not actually be a part of the print. I will be printing them separately and mounting them on the final print to add more depth.
Ideally I think vinyl adhesive would work best and then use some kind of shellac, perhaps to give it a nice glossy look? After I have adhered the larger image I will do the same process with the smaller images and mount them with screws coming through the back.
If this sounds confusing I will try and post a diagram later.