It was burned up, and will not be rebuilt. We learned a very great deal from Space Clipper Graham. Prior to that ship it wasn't thought possible to fly a vertical takeoff and landing ship at low speed, or to control its attitude from vertical to horizontal and back to vertical. Clipper Graham did all that and more. It is my opinion that the best way for government to participate in technology development is through X projects, and that the entire X series from X-1 on has returned to the American people a fabulous profit on their investments.
Picture is available here .
First you will see the thumbnail. Click on that for the main picture. Delivered to the Air War College at Maxwell Field. A not too technical essay on the origins and concept of the SSX spacecraft.