"Check again, supposedly the plans have been lost??? The single greatest accomplishment of man off earth and the plans are lost??"
They were destroyed along with the tooling.
The plans still exist:
From http://tafkac.org/science/saturn_v_blueprints.html
WHAT HAPPENED TO THE SATURN V PLANS
Despite a widespread belief to the contrary, the Saturn V blueprints have not been lost. They are kept at Marshall Space Flight Center on microfilm.
The problem in re-creating the Saturn V is not finding the drawings, it is finding vendors who can supply mid-1960's vintage hardware (like guidance system components), and the fact that the launch pads and VAB have been converted to Space Shuttle use, so you have no place to launch from.
By the time you redesign to accommodate available hardware and re-modify the launch pads, you may as well have started from scratch with a clean sheet design.