lots of surface area in a decent glue joint for a 1/4 " board,
so i would not worry about the need for something like finger joints.
for me the need for multiple thin strips is more of a practical matter.
most boards available to me come as 3/4" think planks, usually flat grain.
( the exception would be 1/8" balsa planks or wood veneers sold for furniture and now surfboards )
lots of waste to plane 3/4 " down to 1/4 or 3/8 core.
so i rip saw the 3/4" flat -grain into multiple 1/4" quarter-grain strips
you can glue/assemble the strip onto a rocker table if you wish.
but without a matching piece on top , or steaming , or something else to resist the bending shear it will just return to 'flat'
i'm not the first to figure any of this out:
you can take a peek at john B's thread for a wooden makoviewtopic.php?f=1&t=2359282&hilit=wood+mako
or do a quick google search for building a strip built kayak
two thins sheets of wood on the rocker table will be fine
wood core with 4 oz glass laminated top and bottom to set both rocker and concave