LOL I hear ya. If I stick with the 3/4" and 1" MDF as per my drawings or even move to the Corian I just happen to have some off cuts laying around I'll be building a torsion box bed. My alternative is to go box steel as you have mentioned but for my first go I am trying to keep as much of the fabrication in-house as I can. Are you familiar at all with the Mec-Mate design of CNC router I also have plans for that build but was concerned about costs. Now with your information it may be a better direction to go.