No bracket adds "substantial hydrostatic buoyancy" it would have to be the entire width and pretty long to do so.
Most transom to bracket jobs look to just offset the extra weight of a 4 stroke, not add buoyancy above what it previously was. this is why the euro transom came about. more strength more actual buoyancy.
the classic mako site has some very indepth and educational threads about switching from open transom to closed with bracket. most of the best were nidacore jobs and rebuilding the ends of the stringers to accomodate big modern outboards.
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