This is my setup for scanning slides. The backlight uses the RGB trick, it's an LED strip which I cut up and arranged in a matrix, then used a diffuser film from an old LCD monitor and a bit of acrylic.
Since it's single slides, I just decapsulate the film and this little magnet clamp/holder thingy I printed in PLA holds the edges flat which works well enough.
The camera bracket is PETG and braces the lens which means I don't have to faff around with yaw adjustment.
I used a Pi to control a little bluetooth remote. The Sony has a built in FTP upload which is super useful.
Everything else is aliexpress tat, but it's all straight enough to not be a concern.

Since I don't actually shoot film and this was just for archiving family stuff, it's all kind of disposable