I do not know anything about this, but I bumped into this thread while looking around for CQ mods.
http://forums.seriouszone.com/showthread.php?t=64494
It appears somebody Is creating a mod in Serious Sam 3 based on Chex Quest.
Yes, he has posted a couple times on here. In fact he posted less than a week ago with a link to that page saying he was finished. XD Not sure where it is, but I think 75 said it was in his subforum... idk.
I gotcha.
http://www.chexquest.org/index.php?topic=3981.0