OK, yes, boats can be built and heavy rains happen. But one man and his immediate family could not have built a boat large enough to house 7 of each animal (2 of "unclean" ones). Marine engineers playing around in their spare time estimated the size a boat Noah would have needed and it could not have been made of wood, as it's not strong enough. There's a reason really large boats were never built until they learned to use steel. It's because a really large wood boat would not be strong enough to support itself and would break in half under it's own weight.
This is discounting the entire basis of the story which is the most ridiculous part. God is pissed because the people he created are sinning so he kills them all except one family plus the majority of all the living things on earth? I'm not God, but if I were, I'll guarantee you I could come up with a MUCH less violent and evil way to deal with that sinning problem. And... there was never enough water to cover the entire world. Back when this crap was all written, they didn't bother to think about that because people were all basically pretty ignorant.
Bubbaís first cousins ex wifeís best friend ex boyfriends uncleís neighbor has a Jon boat. He has a friend thatís a carpenter helper. And he says they couldnít build an Ark in those days. He ought to know because he worked part time cleaning for a marine outboard company that sells motors for Jon boats.
If anybody wood nowed it would be Bubba.