Hello, I’m in the process of building my product and trying to do most everything on my own. I’m at the point I need to do CAD drawings. My question is what is the best FREE CAD design program? I essentially need to build a metal box with a plastic interior. 3’ x 3’, just to give some context. Mechanical components are inside this box but I’m not trying to build my own control panel with this system, just the exterior housing and mechanical components. Thank you.