You must be smiling every time you look outside and see that set up. It looks great and looking forward to learning about your adventures, traveling in it.
I like your battery setup. You have mentioned you have plans for venting to the outside, for your off gassing. I have a large bank of GC2 Interstates too. In two years + of service now, I have started finding the surrounding organic materials displaying gas damage from the off gassing of the these batteries. My batteries exercise every day and I have used about 1.2 g of distilled water over a twelve month period, over 8 batteries. With my personal experience I would voice some concern in viewing the pristine galley you are obviously planning on using. If you could isolate these batteries to vent outside, without venting in the galley, would be my suggestion. Also, what means are you using for maintaining this battery bank. Access appears to be challenging.
I wish I had that reclining sofa!
b