Easy peasey
  Build a platform table and lengthen your clamp frame.
Looks like 3 or 4 inches would do

But I bet 6" higher would put the work up at a comfortable height for you

This table is 7" off the deck and a little higher would have been even 
better

http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/shavehorsez.jpg

   yours scott--
*******************************
    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html