...bumping an old thread...
I just watched part one of "When We Left the Earth" which made no mention of the ATDA rendezvous during Gemini IX! You'd think the Angry Alligator would make for some good TV shots. Anyway, it got me thinking of the old model of mine which Saturn V has shown here.
At the time that I modeled the ATDA (way back in 2005), Rob intended to code enitire launch sequences for the Gemini docking targets. These were to include fairing animations for the ATDA. At least, I believe this was the plan. I haven't communicated with him since this time though, and I don't know of the project's current status.
However, Project Gemini is released under a BSD license, which also permitted me to scavenge a few bits from the ATV model; so perhaps the ATDA could be released on its own under these terms? If there's any interest in this idea I could always shoot off an email to Rob.