sprayer boom?

split toe

Anybody have a link for making a sprayer boom? I need to make one for a old 250gal continental-belton pull behind sprayer. Been using it as boomless because thats how my grandpa always did. I need it to fold, and probably have a coverage area of 10-20 feet.

I guess a alternative is to buy one, but they appear expensive!
I don't have any links but I extended mine by replacing the middle existing tube with longer, keeping the breakaway part out on the ends and adding two more nozzles. It was 1 inch square tubing. I showed it on this site somewhere but I'm not sure where. I'll see if I can find it.