This one would be a good one to try your hand at. It looks like a simple 3 layer cut with an engrave on the top piece.
Grab a guitar image of your choice - Google image search can help or check out the Noun Project or any other source of public domain or Creative Commons shared clip art. It’ll help if it’s a vector but lots of options even with bitmaps.
In Inkscape do an image trace to get the outline. Grab a Chicago Screw (you can get them from Home Depot or Lowes) and measure how big a hole you’ll need. Drop a circle that size on your design. Copy it twice.
The first copy is the bottom. The second copy can be the middle and the third your top. The middle needs to have an internal outline defined - it’s going to be the other cut you need. Alternatively you can grab a Pick pic and get an outline that you drop into the middle piece that will be pick-shaped. You may want to add a finger notch by merging a D shape or circle with the pick outline. You’ll also want a small hole for the closing magnet. Size it to whatever tiny magnet you might have.
Then for the top layer drop whatever engraving you’d like including personalization or whatever you like.
Take that copy and make another copy that you mirror and give a different color. This will be the underside of the top layer. You’ll need something for the magnet to attach to. Make a deep engrave for either another magnet or a small piece of steel (tiny washer?). You want this in a different color because you’ll do all of the other cuts and engraves on one pass and then this last engrave as a 2nd pass after you flip over the top piece.
A handy thing to do in the first pass would be to score the outline of the mirrored top layer. Then in the 2nd pass, turn off the first 3 sets of cuts and change the mirrored top layer from a score to a cut. The score will be on the material in the bed and give you a place to drop the top piece on so you don’t get any alignment issues on the 2nd pass.