Project complete and very simple to do.The following steps will raise the Egg pizza stone to where the tip of the bge thermometer is about 1/16th of a inch from touching the stone.
Install plate setter legs up.
Put standard grate on top of the plate setter
Use 4 1/2 inch carriage bolts (three equally spaced on a 14inch grid) a Weber worked for me.Have the top of the bolt resting on the top of the 14 inch grid.On the bottom of the bolt use two nuts and a washer that will make a stable foot for support.
Set it on top of the main grid.Done.