I joined Bruce’s website months before I built my bench. I had already had a big six motor homemade bench that I bought with all electronics but it worked at 10 inches of depression. I the bought a big blower bench with 2 manometers and hated it. The weather affected it all day long. So I sold it and built my current bench. I then sold my old electronic bench to a friend at a giveaway price. He played with porting before but has learned a lot now. Bruce is out in eastern Pa and is great to work with. Back then his plans were 50.00 but I’m sure they aren’t much more now.