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How 'bout taking a look at how your floor is made? I mean ribbon board, joists, brackets, and so on. You can get as serious as you want. I would probably put the joists no further than 12" apart.
Heck, 2 x 12s span quite a distance and your 'box' is gonna be a heck of a lot smaller than that. My best to ya and hope this helps.
Jay J -Moderator