This Sukkot, we had a rather interesting setup with one of our decorations. We have a chain made out of foam links. We've been building it up for years - it's got over 850 links by now. It's so big that we decided to do something that isn't standardly done - we stretched it out so that it left the Sukkah, weaved around for a while over the front door, and then came back and zigzagged around the Sukkah. While it was over by the door, you could not see the Sukkah if you were standing by the chain.
Is it allowed to touch the Sukkah decoration that is hanging in the Sukkah if it is also outside the Sukkah over Chol HaMoed (since I'm assuming it's muktzah over Chag itself)?