We have an aluminum back plate, and I actually use a Cricut cutter to engrave it. I have the original manuals and software; they are on 3 1/2" floppys, and made to run on Win 95. The other thing to consider is how fade-proof the label ink is. I have this one guy that requests I label them and they are always humbuckers. The same crap they used on transformers, light housings, etc..
I also use the Cricut for packaging stickers, iron-ons, and even to make a vinyl sticker which I can attach to the case as a temporary design. I've been planning to get this machine running to do some of my engraving. The quick test is to leave a label on a windowsill exposed to direct sunlight for months, and see if it fades. Once dry you have to work pretty hard to remove it.
You’ll see the inspiration for launching Eastwood Guitars in these images below. I took it to the local luthier and asked him to refinish it, to remove the awful sticker. A couple of Fender Duo-Sonics, which were the inspiration for the Warren Ellis Tenor Series.It is hard to imagine today, but in the early 1960’s having an electric guitar in your home was rare.In fact, it was likely that your parents were steering you in the direction of accordion lessons. The Beatles – and of course others – stopped all that.Good inks may fade a little in a year, but remain legible. We have an aluminum back plate, and I actually use a Cricut cutter to engrave it. I have a fairly nice German CNC circuit board engraving machine from 1990, which I bought from a friend.I also use the Cricut for packaging stickers, iron-ons, and even to make a vinyl sticker which I can attach to the case as a temporary design. It's fine mechanically, but it needs someone more knowledgeable than I to sort out the controlling software.