I think just a standard "c" chanel perimetre frame with some "i" beam or angle iron cross bars would work spaced out every so many feet between the timber deck pieces.
So think big chanel flame each end fastebed to the frame rails, slid timbers into chanel, then slide in angle or i bean, more timbers, rinse/repeat till you cap the end at the length you want. So you basically end up with everything incased in those "c" chanels ...everything bolted together and then clamped to the rails.
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