Glad to see you found this approach to be useful. I had applied it to one of B. Harry's "The Carnage Continues" maps a few years ago, with marvelous results, and sent him a copy. But having never heard back from him(?), and having received no comments on the technique at Blood Freeminded, I was beginning to think this might be "old news".
As for "retail", indeed! I've noticed that degradation even occurs in the carousel in Monolith's own "Dark Carnival" level (E1M4), though it can take a relatively long time to manifest there.
Many thanks for the feedback! It's nice to know that one's efforts are appreciated.
Discussion about Blood and its addons.