when i made mine i just gut some old ends off of a scrappy car worked out what the lenght of braid pipe i needed with abit of string then gave it to the guy. made them with in a week with correct ends and correct length pipe.

i would of though the best thing to do is get as many of the thread nips as possible then work out what lenght you need and get braid aload of braid sets made up.

failing that find an old donor serria as i would imagine the pipe configuration is the same in most parts.