Saw-horses are made of square wood 7 x 5 cm. Tubings are cheap polypropylene sewage pipes which you can get in any plumber’s of hobbyist’s shop (homedepot, etc) for about $7 per meter of length. Its 125 mm diameter and sold in lengths of 1, 1.5, 2 and 5 meters. You can cut them for any length you need, just for ending you will need caps and also connector (connector has inlet sockets on both side so you can insert pipe from one side and cap from another). You can glue it but I recommend having it detachable just using seals.
We have opted for 12 plants per tube which is 250 cm long. Our goal was Sea of Green style, mimicking “stadium effect”.
In each tube there are inserted 5 cm water plant baskets which hold plant inserted in clay peebles. It is enough to hold support for plants which as you can see overgrown little bit on our first attempt :).
Along with each pipe leads black hose connected to high pressure deposit pump. This hose is attached with clamps (see pics) to brown pipe and each 30 cm there is drilled hole and sprayer protruding from black hose to tubing. This sprayers ensure mist-like environment in tubing. We have them running 24/7 so there is constant stream of well aired nute solution.
On each saw-horse is 150 cm wide and 250 cm long and there are 7 tubings forming V shape and creating stadium effect. This has worked, but planting uniform clones of single strain is preferred. We had some troubles because of plants in the middle overgrowing the rest and one of disadvantages of this system is that you can’t move the plants throughout the vegetating phase.
Saw-horses were built so there we allow gravity to do its work and drain out tubes into yellow hoses which return water to our reservoir in the middle.