They came to me with detailed drawings and sizes and we cut them all to size. Then they drilled the mounting holes when at home to make sure they worked and secured it all with screws or zip ties. I think it looks awesome, or rather it looks like nothing (It took me about half an hour before I noticed it - and I am much more sensitive to clear plastic than most!).
We do similar less elaborate projects all the time for builders that need to meet code on custom railings (no more than a 4" gap) but where the owners may want to remove it later for aesthetics (nudge nudge wink wink).