How to build a low-cost trellis on a terrace?

Build a simple A-frame trellis with two 6-foot bamboo poles lashed at the top with coir rope and a cross-brace. Net string between them for climbers. Total cost: ₹150–300. Alternatively, tension jute netting between two pipe uprights. Grows ridge gourd, bitter gourd, beans, and cucumber vertically.