I used two unfinished kitchen cabinets from Lowe's that each have 5 pull drawers. I bolted a SOLID core door to the tops of the cabinets. Since I build with magnets I covered the top of the door with a single sheet of 20ga steel which I got at one of the local steel fab places. This installation is heavy (very heavy), flat and level. It sits in the middle of my workshop so I can walk around 360 degrees. I sprayed the steel flat white and then a light coat of LusterKote flat clear. When the surface gets all nasty and ugly I just strip the clear and paint and re-do it. I also mark parrallel and 90 degree lines on the top to help with alignment issues (before I shoot the clear).

Works fine for me.

Dan