Want to build a cave/mine for the kids to have to go through to get to my front door this year. Can't really do a lot if building, thought about putting fence posts in. 2 at top of yard 2 in middle an 2 at front porch. taking 2 cables, 1 for each side and attaching it to the posts. Taking painters black plastic drop cloth from Home Depot and draping it over the cables. anchoring it to the ground with 2x4's wrapped in the plastic. Then doing 3D painting inside to make it look like a cave inside. then add props. Think this will work?