I'd say that if Saddam actually has nukes that they are probably already here. I wonder how much lead shielding it would take to conceal radiation from weapons grade U235 or plutonium from our satellites that are built to find this kind of material?
It was super high-tech for it's time and probably is still. I worked with the mechanical engineer's that installed the lead shielding and it was 3/8" thick.
I would bet the metallurgy advances has reduced the thickness and weight significantly. Even at 3/8" thickness a trawler could easily be outfitted to accommodate a "hot" cargo.