No, I'm not using the cloop module, I'm using some utils, binary utils, included -at least in Debian- in the package cloop-utils.

I think in your way is needed the cloop module. I am using Debian Sid, with a precompiled kernel, and see what it says me:

mount -o loop KNOPPIX.iso iso
sh iso/KNOPPIX/KNOPPIX extracted_knx
FATAL: Module cloop not found.

Or I didn't understand you?

Regards.