I was unsatisfied with the backshells available for download, and I had none handy, and I figured it wouldn't be a tough build. These clamp together nicely and are locked together by the SHCS when assembled. They fit Tayda D-sub connectors, not sure about anyone else's. Print it out and see as they're like an hour each; I've discovered that there are a lot of crappy d-sub models out there, too, so best check.
The author hasn't provided the model origin yet.