The NASA e-11 was a ROTJ resin blaster with the t-track similar to these.
One more thing to note. Although all the Kurtz props seem to have similar t-track, this ESB saber's t-track seems to have slightly different profile, and it is made from a different material (this stuff is red/brown underneith, the material on the Vader ESB saber is grey).
I'm not saying that it is impossible that these props were rebuilt. But if they were, why leave off things like caluclator bubbles or a circut board. These are probably the easiest parts to come by. Why leave off a kobold flash mount, and why substitue a d-ring bracket that is different from anything seen on the lucasfilm archive props?
I mean, if someone wanted to forge a prop, it would be easy to use Gino's grips, or Saberfreak's stuff, and say "look, just what you excpected to see".
my .02
Dan