I found a plastic square jug that's exactly the capacity and shape I want. My engineer friends tell me I can heat/stretch the flat bottom into a cone. I've seen videos that show people adding taps using bulkhead fittings. My question is, since the cone-bottom valve is supposed to dump yeast (preferably all the yeast), is there a way to attach a fitting that doesn't impede the flow of lees?
With metal, a pipe would be welded on. With a bulkhead fitting, there will be a protrusion on the inside, like the wall around the top of a well.
Does this work? Is there a better way, like ultrasonic welding on a plastic threaded tube which is wide and narrow enough to clean carefully by hand? I really want to try plastic the first time because the cost is practically nil for exactly the size/shape that will let me brew 2x7 gallons in my SOFC.
With metal, a pipe would be welded on. With a bulkhead fitting, there will be a protrusion on the inside, like the wall around the top of a well.

Does this work? Is there a better way, like ultrasonic welding on a plastic threaded tube which is wide and narrow enough to clean carefully by hand? I really want to try plastic the first time because the cost is practically nil for exactly the size/shape that will let me brew 2x7 gallons in my SOFC.