Ah one of the beautiful features of SketchUp is generating templates of the components that have been modeled, we print the templates and affix them with some spray contact cement to some 3/16″ baltic birch plywood. Baltic birch plywood is easily shaped, doesn’t contain nasty voids like other forms of plywood and the baltic birch templates are more durable than MDF (which we use for larger templates like the top of the case)..