Building and Wiring a 3 bay Battery Box on a Small Sailboat

We'll cover battery relocation, designing and building a battery box, wiring and setting up breakers, and then attaching to the boat's electrical system. The box contains 3 AGM 12V 100Ah batteries (Group 30H size, 12.1"L x 8.5"H x 6.7"W). A 780Ah Optimum Start Battery is housed in a separate box behind.
At the end, I include some sailing video on our son's Pearson 365 ketch as we enter the Chesapeake Bay from the Atlantic Ocean.

[@stephboeker7835]

I may have missed what type batteries you chose for your house batts. ?? They don't look like Lithium Batts. and if not, what type did you choose ?? Was it Marine ? Deep Cycle ?? AGM ?? Lead Acid ??
What were your reasons for your choice ??
I'm getting ready to purchase batteries for my restore and all I'll have to power are lights, bilge pump, Audio & USB charging stations etc ... Not a whole lot of amps I guess and I'd like to hear what to think of when choosing.
Thanks for your generous consideration,
Sincerely .......................

[@trailsandsails2722]

Thank you very much for your very helpful comments. I have included some information about the batteries in the movie description addressing some of your questions. These AGMs are typically used in solar power systems. If I could do it over, I'd go with Lithium batteries as they have gotten much cheaper (but still 2-3x the cost) and have more safety built in now. So many advantages- charge much faster, can be drawn down more, and much lighter.