There we go...
There are the jet engines... And a bigger fuselage for internal payload stowage.
I was thinking maybe Blackhorse would be a bit too far a leap... This one looks more like a more conservative (and feasible) step.
By the way, is there anywhere on the web I can go to for more frequent updates on the progress of the X-43? What is the board's consensus on the viability of the scramjet technology for SSTO?