Hooooo-boy! That's a heck of a build! That'll be a fun one but a bit if a slog! I just finished something similar (not for my tanks, but for some equipment at work, but similar architecture) and it took 200 hours to build the electronics, the equipment and program it! The worst part was that I had only 2 weeks to do it...
If you have a need for custom PCBs, I can point you in the direction of a few good places I have used... But then again, if you know how to design a board you probably know where to have them made!
Have fun!
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