Some news about the batteries box, started to work on that two days ago with some delay.
What I will do is kind of batteries tray on to which I can add a cover. Not sure I will need the cover as the + post will be protected by a plastic cover, but will see later on.
Here is the rough plan of what I am doing, top view and side view:
I plan to put each battery on a stand, empty in the middle to act as an acid "receiver" in case of a leak.
Each stand will be separated to the other by 3/4 inch. Battery will be enclosed in his own "cell".
Below one of the 4 battery stand that will be epoxy glazed, empty middle will be the so called "receiver":
Here are the 4 batteries I will install:
I am lucky they can be charged using solar power ouf!!!