I was in the landscape-irrigation industry here in San Diego. I think I can probably find the Venturi at one of the wholesale irrigation supply warehouses. That is actually the biggest expense. Then while I am waiting for my rock to cure (6-8 weeks) I'll have time to cut the acrylic and fittings and glue it up. Fairly sure that if the acrylic tubing is too expensive a square configuration for the main body can be incorporated along with the inner tubing. The collection cup design might be a bit of a challenge. It should be removable and also have a drain fitting.