The law is that all hives must have removable frames.
The thought is that skeps and the like can harbor diseases, you also have to destroy the hive to harvest the honey.
Not always, rope skeps were made to accept bowls, buckets, and other objects as a removable honey super. Some just placed a large jar atop the hive and harvested it when full. I mention how to make a small demo model the the craft section.http://forum.beemaster.com/index.php/topic,18062.0.html