It is a good idea to grind the mill scale off of the surface of the metal parts that will be welded together in order to ensure a good weld. The sanding pad on the angle grinder works well for this and a bench grinder also works well.

If I was a welding machine this shiny metal would make my mouth water.

As the parts are cut they will be spaced on the table in their propper place.

This is where the wooden blocks come in handy to hold the frame members firmly in place so that they can be tack welded together.

A scale pattern of the frame made out of chip board is a great help in getting the parts positioned.

The floor frame is now ready to be tack welded.

I forgot to mention that it is a good idea to pop a chock line for the centerline of the frame. It will be of help to know the exact centerline of the frame in order to make sure that the right and left sides are equal.