A boat hull structure includes an inner layer formed of multiple inner
plates each having two mounting flanges at two sides, an outer layer
formed of multiple outer plates each having two mounting flanges at two
sides, multiple spacer plates connected between the mounting flanges of
each two adjacent inner plates and the mounting flanges of each two
adjacent outer plates to keep the inner layer and the outer layer in
parallel and to define a plurality of independent air chambers between
the inner layer and the outer layer, and fastening members affixing the
spacer plates to the outer plates and the inner plates.