I've settled on making a desk very similar to this. I am buying metal legs, but I need to build the top and it looks pretty thick maybe 2-3" thick. I dont want to make it completely solid as that would be insanely heavy. I am going to make this about 8ft wide and 30-36" deep.

How would you make it? I was thinking about using a torsion box design with 3/4" thick material all around. Is there a better way?