The capturing rig itself is pretty simple. It's a straightforward project box you can get from amazon. The camera is an astro camera, but you don't need that- a straightforward USB camera from Arducam would work fine (it has to be a wide angle or accept wide angle lenses. Or a raspberry pi High quality camera. That plugs into a raspberry pi which runs some sort of script or cron job to take a still image. There are CLI tools to do this as well as modify the camera settings (exposure, white balance, etc). There are some holes drilled in the case with a simple plexi dome. Note inside the dome is a ring of resistors which are given electricty through a relay (which is under software control by the pi) to heat up and keep the enclosure clear. I also see a pressure/humidity sensor (likely used to control the relay) and a fan and some desiccant to help keep it dry.

For the software processing you can use anything; I would write a python script to create a large canvas, and then downscale the images and place them at the appropriate location. You could also load the whole dataset into a large tensor and do anything you want with it.