It has been a lot of years, and I don't remember any of the details of his installation. When he left the Forum, he asked me to save a bunch of his pictures. The only one that has anything to do with his battery change is attached. It was titled "Dual 6-volt battery" and dated 9-24-2013. What I see is that he did NOT cut into the floor - probably reinforced it. His two batteries are in a single box at the opposite end of the compartment from normal.
Mike still checks in once in a while. Perhaps if he sees your query, he will get back to you.
Bill
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