I have been using rivnuts on some of my multilayer signs, i install the rivnuts backwards on the back layer and they provide a connection point and set stand off distance. I make peck marks in my designs then drill to appropriate sizes. Another method I have used before incorporating the peck marks was to lay the layers on top of each other and simply drill pilot holes. Again this insured perfect alignment. Amazon has tons of screwhead types so you can pick the ones that work well with the feel of your design. You can also weld the rivnuts on and use them as hidden connections as well. The awesome aspect from my experience is no welding on mostly finished signs that are multi colored risking damaging finishes. And if paint does get screwed up it’s super easy to disassemble and repair then bolt back together.
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