that late iron/ steel use is a question for the Pyramid builders too. which was done during the time of the deluge bsw.
researchers tried with stone masons using copper, bronze tools to shape such blocks, and it took more time to keep the chisels sharp than to hammer away.
The pyramids were just stacks, there is no way to build a wooden, stressed structure with fasteners only, even if you have first growth timber hundert meters long. build with dulling , saws, axes, planes, chisels by a crew of 4.
Wooden dowels, copper rivets might just hold for 9 month, even show less rust than iron.
P.S.May be Noah used the daughters of men to distract the angels, soon to be demons, that handled the twirling swords at the entrance to Eden to let them analyze the new metal alloy, and speed the assembly of the ark?
Notice that both Noah and Jesus were woodworkers. tall tales of tall ships.