re: Cable Entry/Exit (a work in progress)

The scallops look like something I'd do since it is effective and quick to make, however your custom job is very thought provoking. Has a lot going for it, especially the way it will lie flush and is easy enough to make. Of course you'll need spare holes/plates for future proofing. Also has a nice medieval torture device vibe 🤠

Wonder how well it'll stay put when loaded up, might need some turn tabs, like used on picture frames that can be rotated for locking or maybe more meat that gets sunk into the case.
Another thing might be keeping all the cables in place as you put the other half in place and into the recess.

Either way, it think it is brilliant!