This is not my drawing but was sent to me by another fellow through the Northern Brewer Forum.  My beer tree differs from this due to the size of kegs that I acquired and the material I had on hand.  The keg size you have and the placement of the spiggot will determine the levels of the mash tun table and burner placements.  I built a larger mash tun table so I can mount the water filter and burner controls under it. Additionally,  the larger table will give me some workspace for spoons, and such.  I widened the base of this stand so the stability of it would not be in question.  I filled both kegs and did not note any tendency for it to tip or tilt.

Beer Tree Schematic