With my parents project I used my flatbed scanner that I still have, but several issues. While would load 3 at a time, it was so slow. While photos could be scanned at 300 to 600 dpi, small negative and slide scans required bumping it up to 2400 dpi minimum. The other issue, scanned in jpg (default) or tif requiring even longer scan times - but more adjustments available in LightroomPhotoshop than jpg. With the box/camera setup, much faster despite one at a time and shoot in RAW. Was blown away when started bringing out detail in the shadows or under exposure that wasn’t even apparent when projected on a screen - but somehow recorded in the RAW photo. It doesn’t matter which method I use, flatbed or light box, they all need final finishing in Lightroom.
While heard of the light box method, already had most of the components, camera, lens, video led light, white poster (foam) board for internal lining, so tested the concept with a cardboard Amazon box heading for recycling. Was blown away with the differences noted above so built box with a couple modifications. Wood is rigid, but added footpads so wouldn’t rock on table. Also, while heat was never an issue with an LED light source where would be with incandescent, did notice a temp rise, so designed the fan cooling with a low decible computer fan that accepted a USB power source. Did design a foam tunnel with upper and lower air pull by the fan but a flat surface raised off the back wall that is the back surface directly in from the slide opening so the fan doesn’t show through the slide.