2 options, there's a addon that hides the top art but leaves the buttons visible, or use /nui console to hide it.
http://www.wowinterface.com/download...t_Console.html
http://www.wowinterface.com/forums/s...ad.php?t=21199 ;
/nui console {on|off|mouseover}
Sets the visibility option for the top console where 'on' always show the console, 'off' always hides the console and 'mouseover' shows the console when the mouse is over the console.