Here are the pics of the spray bar. It is very simple and straight forward. For simplification purposes, everything is 3/4" PVC and for fittings T = threaded, S = slip.
I come out of the supplied FX6 hose with a T x S adapter. However, I realize you are hard-plumbing your lines. I then attached a S x S, 90 street elbow into the adapter. Out of that is standard 3/4 PVC pipe run into a coupler. Then another section of pipe run into another coupler. Then a S x T adapter with a cap screwed on it.
Each section of the 3/4 pipe is 13.5 inches long. Given those lengths along with the couplers and adapter and cap, should give you 4" of space on either side of the bar when centered in your 75. I cannot recall the spacing I used when drilling the holes in the PVC but some simple math will give you the proper uniform spacing. It's better to do this with the bar fully assembled. After getting everything measured, cut and drilled I sanded it. Then I applied two coats of Krylon Black Matte spray paint.
I did not cement anything as I wanted to run and test different configurations. ie - 1 section vs 2 sections vs 3 sections, aiming each section of the spray bar at different angles, etc. I know you know this but be sure to clean and cement everything prior to the spray bar. Also, don't forget to throw a union in each line for easy removal.
Finally, and I'm not sure if you know this or not, the flow coming out of the spray bar will be strongest near the end cap. In other words, you'll want to have the end capped end furthest away from wherever you place your intake line.
And here's a pic of the intake.
I've tried to make this as easy as possible to understand. However, my understanding and your understanding may be different so don't hesitate to ask me any questions. Oh, and because you're new, I'll give you 1/2 off my regular charge rate for answering any questions.

;Hilarious
