Advice for new train horn setup

Let me just start by introducing myself. My name is Chris and I live in south La. I am new to the train horn world and would like to go over the setup that I plan on getting and would like to hear peoples first hand experience and guidance on what sounds right and wrong on what I will be doing. First off I will be piecing everything together. The horns themselves will be bought from realtrainhorns.net. ANY THOUGHTS or CONCERNS about them? I am looking at the K5LA, but will be mounting them on the individual brackets that the sell and mounting them along both frame rails on a 2012 F250 SWB. One question I do have is if I mount them facing the same direction will there be any detrimental effects in sound quality being the horns will be spaced out and not sitting on the original manifold? The compressor will be and AZ OBII. The tank is going to be a seamless tank from speacialty suspension in CA. It will be a little over 5 gal capacity. This will be a custom built tank as I am changing the ports sizes from what they usually sell. I am thinking 8 (1/2’’) ports (2 on each end and 4 across the front and 1 (1/4’’) drain port offset 90 degrees from face ports and centered on the tank. Any thoughts on ports sizes on what i should go with as this will be custom and only want to do it once. I am aware of the the pressure switches and relays and all wiring that I did not mention in the setup. However the valve for the horn will be an electric GC 350. Please feel free to express any pros, cons, thoughts, and concerns about the setup because I would like to get all the info that I can prior to getting any of this started. Which I would like to do very, very, soon as my wife who was completely against it decided she wanted to get it all for me as a anniversary/birthday gift. Thanks to all in advance

I have two OBIIs feeding a 5 gal tank and I wouldn’t want anything less than that. I have a 150/180 pressure switch, and when it hits 150, it takes about 30 seconds to fill. You need to ensure you have enough pressure in reserve to BLAST EM AGAIN, if need be…