There is information about building a horizontal router table somewhere on this forum. This type of table used with vertical panel raising bits is by far the easiest way to create large panels. Your router is mounted to a piece of plywood and a pivot hole is drilled on the left side. With a bolt or wood screw acting as your pivot point you make an additional hole on the right side and elongate it by allowing the panel to swing. This arc is for your height adjustment. You mount a vertical panel raising bit and set your height so your wood passes under the bit. The plywood acts as a fence, this set up can be bolted to the end of a work bench. If you use this method you will want to screw a piece of 1 x 2" above the bit to act as a safety device. This design is strictly for edge treatments.