opinions on how to build a wall Turntable shelf

I am going to build a wall shelf for my Thorens TD146 turntable. My stereo rack sits on top of a wood joist floor, but the wall behind it is a thick (load bearing) plastered brick wall :). I am going to build a wall turntable shelf. The shelf will be attached with lag bolts into drilled holes with the lead inserts into the holes. My question is: Do you think I should build it out of hardwood, with glued joints, or should I build it out of angle iron and steel, with welded joints? Any other design issues that I should think about? thanks, -JB