We assembled the shade structure yesterday, with a few modifications. We decided to use wood screws to hold the 3-way side outlet fittings in place, so we don't need any PVC cement. We also decided not to use supports at the center of each long pipe, because the structure holds together fine without them. That eliminated the need for the six slip-tee pipe fittings. Those two modifications shaved $13.50 off our material costs. Including the cost of the six side outlets, the packet of wood screws, four spring clamps, and the nine pieces of PVC pipe, the entire structure will cost us just a little over $55 for a ten-foot by 8-foot by 8-foot structure.
Here is our first build. We have not yet put the screws in, and we still have to decide whether to grommet the canvas and secure the tarp with bungee cords or use more spring clamps, like we are already doing.