Haven't tried negatives - and didn't design the test box for film but could easily alter to attach a custom carrier covering the "hole in the box." May do that in the future so can shift not only from slides to negatives but from 35mm to 120 with custom carriers. For negatives would need some conversion software like Negative Lab Pro for saved scans as a positive, where slides, no conversion necessary. Would probably still use my scanner for negatives as those are short runs - not trays of 100.
Shooting in RAW, still need Lightroom - and amazed at the correction and dynamic range able to bring out. Most critical are color correction renewing the aged slides with their color shift, and dynamic range in the shadows never realized was there.
The lightbox was a variation of a YouTube video where taped a bulky shop lamp, using reflected rather than direct light. I took an Amazon Prime box lined with white poster board and used a video LED light reflecting off the back wall of the box - direct lighting would show each LED as hotspots even with an opaque filter. With Sony, Lightroom tethering isn't natively supported like Canon and Nikon, requiring an intermediate software. There are multiple YouTube videos on how but I just use Sony's Imaging Edge (free) without linking to Lightroom, saving the batch to a folder then import the folder to Lightroom...or if just a few scans, use Photoshop. There is a software that caught my eye, Sharp Shooter 4, that has a huge advantage of keywording as individually shooting, but uncertain if it handles negative conversion.
If any design feature I need to do with the box is design an adjustable base to secure it to with a screw drive to fine focus by moving the box and maintaining the 1:1 macro level.