Dont get it too high, big planes are taller. And too wide doesnt help either. When i built my carf tutor I learned my 25 year old worktable was too tall.I have built thirty or so planes on it-never an issue, but having to reach down inside the tutor was a pain. 40 in wide compounded it as if you had it off to the side you couldnt reach across from the other side to get to it.