Welcome to the SeeMeCNC Community

Just assembled the enclosure. 1/8" foam core is opaque, but readily available (at framing stores), relatively cheap, and a good insulator. I sealed it up with aluminum tape for ducts.

Jfetting, could you post the source files for your design? I want to build this with rigid foam insulation to save money, but the thinnest sheet I can find is 1/2".