Here's a couple of PICS from my ATV engineered sprayer.  I got the idea from the bar on the Fimco pull behind sprayer.  The nozzles are 40" on center and I use the 140 degree spray tips that give me about 8 to 9 feet of coverage, this gives me a good over lap behind the atv.  Not sure where you are located but Agri Supply, Thiessens and several online stores carry all the connections, tips and filters.  I used the Fimco stuff from Agri Supply and bought heater hose from a local auto parts store.