Hi! I'm the one that originally linked Randy to this thread. Some excellent work has been done here, and I look forward to the day when we can play through some new episodes on SNES DOOM!
I know Rand was thrilled with the interest in his source release, and we've both reached out to id and Bethesda a few times, but he's yet to receive the OK on releasing the assets. I'll keep trying though!
As an alternative, he has started work on a tool that would allow us to extract the assets from a ROM, but it's tedious work and he's currently busy expanding and promoting his most recent game, Cyboid.
Anyway, he launched a personal profile on Twitter this week, @RandalLinden, and he's grateful for every follower he gets. He's also happy to answer any questions about his projects there.