Instead of using the pipe and sprayers. You might think about top feeding the Rails. Install sprayers through the top of the Rail with a sprayer between each net cup. And yes using the 5 inch Rails gives the plants more root space..
If anyone want help with thier systems than log onto the real Stinkbuddies website. That's where you will find Stink and all the members that use and have modified this setup.
Stinkbud was asked by High times to write up that artical for them. He is the designer of this system it's has nothing to do with High times other than the write up done on Stinkbud.
600 watt hps will work if that is all you have. For a full SB rail system 1000 watt would give you alot better coverage and light penetration for higher yields