This is the result of a few months of refining the original model, on and off, into what I believe is the simplest and most customizable possible bezel.

This is what the top piece looks like with all of its nickel pieces and inserts:

From there, each nickel piece is placed on, and the top insert piece is placed over it:

The process is the same for the side pieces, but they are smaller and the longer inserts should have 2 inserts.

The hinge cover pieces are best attached with pliers. First push them into the slot:

Then lightly push the plier head down on each side to bend it into not falling out:

From there, the sides connect to the hinge cover, and the full bezel can be placed on the framework 13.

Some other notes:

• Detect thin walls on the top piece should be disabled for some hard-to-print materials like translucent PETG. This will make the bezel slightly easier to pull off by removing some smaller walls
• Your printer should have good tolerances and overhangs for the snap-in pieces and nickel plates
• Here's the nickel plating I use. It mostly just has to be 10mm.
• Pieces on the top and sides can be easily removed by lightly bending that piece. The snap-in piece should lightly pop off