I've prepped files for laser cutting, but never been involved with pricing or arranging for the work.
Looking at the Epicurus file (I'm using Rhino 6) I have a couple of comments:
- From my experience it's normal to provide a 2D file consisting of closed curves (linework). The material thickness is specified in the written order and so there is no need to model the thickness of the finished product. You can include notes as to thickness and material in the file if that's helpful.
- The thickness as shown in the model is much thicker than seems practical, if it was intended to be the actual thickness. But since I think that the file for cutting would be just curves, this doesn't matter; it's just a comment regarding the finished product.
- There are a few "floating" pieces in the model that aren't attached to any other part of the model. It seems that for a wall hanging that it would be best to extend these pieces to a nearby part of the overall piece, so that the final product is just one piece. Otherwise during installation one would have to figure out where these loose pieces go aqnd how to mount them.