or years I have gone with a 4'x8' table 38" off the ground. The biggest factor for me was to have the table come away from the wall like a pier. You can then walk along both long ends of the table and get to both sides of the plane without moving it. You can also put an assembled plane on the table. In my first shop the tables were like counters running next to the wall. It was a real pain in the butt.