I've started making a waterfall for a small stage. The frame is 1x4 and 2x4 construction covered in chicken wire. I'm using 3 sump pumps for a water source. There will also be a small pond for the water to fall into and the source of water for the pumps. The entire structure is 12ftx12ft and 10ft tall. We are using it to cover two doors and to add to our outdoor theme. My question is would it be better to cover in burlap and VSSD or spray foam. Of course this needs to be as inexpensive as possible and will be built in sections for storage. Also the event is in 3 weeks. Thoughts, concerns, other ideas?