Its not a welding table, its a CNC plasma cutter, 6 foot x 10 foot. THe floor you see is to hold water, when the plasma is operating the steel will be immersed in water. What I'm trying to do is make it flat. To achieve this, I am laying the beams on top, so that the weight and the orientation of the top beams pulls the lower beams (lower beams are the table) onto the same plane. It's a long way of making a flat table. I think. No-one has criticised the idea yet so I still think its a good one. I am open to criticism though. The top beams will be removed after welding and I will end up with, hopefully, a very very flat, and very very square, large cnc table.