JoeBob; Having worked with Spencer during the design of one of my first Highbanker/Dredges, I understand where you're going. I'm assuming (and you know where that goes) that you're either 10" or 12" hopper with three windows each side. I did two 1 1/2" builds. The first I used Sch 80 pvc positioned, marked for the windows, then drilled out with 1/4" drill bits on angle towards the grizzly. The marking and planning of the angle and coverage must be thought out of you'll be doing a "do-over"! Plumbers pipehangers will support the spray arms, the elbows, and the ball valve if you're using one.
PS: I have 120 foot of 1 1/2 inch (white)firehose layflat hose in inventory, slightly used if you're interested. I've upgraded to 2 inch on all of my equipment, so the 1 1/2" is in a storage container, along with schedule 80 fittings, pipe and one ball valve. Email me if discussion is needed.