Rail sliding pulley mechanism for Garden Shade to be installed at our home

I designed a two-way pulley based rail mechanism for the sliding of garden shade net like a curtain. The challenge I faced here was that the sliding rails tend to be expensive, and for a large project such as this one, it would'nt be practically feasible to build it around rails. So I finally settled on the use of bamboo pipes as an alternative to the rails, which gave it a beautiful look, hence hitting 2 targets with one arrow.