It took weeks of fiberglassing, sanding and shaping, but I finally modified the rail on my 767 center pedestal to match the shape and thickness of the 777. The modification consists of 3 layers of fiberglass and a 1/8" sheet of wood to create the thickness. All modules are OEM except the FDS Pro-MX CDU.

For all the steps involved in this process, please see the link below the photos.

Completed Center Pedestal

Original Center Pedestal

Conversion process documentation

Full photos

Robert Prather