just layout the parts as shown, glue together, and drill holes every inch. make the holes small to start with and then you can tweak by drilling every-other hole larger until you get the flow you are looking for. if every-other hole doesn't work, drill them all bigger. but get too big and you will have to start over. I can't remember off the top of my head, but I think I have 3/16" and 1/4" holes in this spray bar. Instead of just capping the end like I did, I would make both ends look the same and then cap one. that way it hangs itself on the rim instead of having to suspend the one end with a zip tie.
Good to know, thanks. What's a good diameter size for the actual spraybar?