Yep, that was interesting to read about. The BBC news site carried it a few days ago. It seems as though the Babylonians were designing a huge coracle so one might imagine, since this is quite possibly the basis for the Genesis story, that the Hebrews replaced the coracle with their own sort of boat - and made it stupidly oversize to the extent that there is n o known way, even now, to make a wooden boat that big.
personally, I reckon Ken Ham should make a boat to the Genesis specifications and sail it. Then we would see if it is even feasible now! If it isn't, well, that's one idiot less in the world!