Track or Pulley Bird Net Question. I am building structures to go over a few of my fruit trees. I want to only use it during fruit season, so I want to be able to assemble it, then attach the netting at the start of the season; then remove the netting and disassemble at the end of the season. My trees as as much as 12 feet tall, so I want to design a fully or track system into this to attach the netting to, kind of like a roll-up garage door, except the weight is just netting, and it needs to go on all four sides. Does anyone have an idea for a design to accomplish this?