Would that not be the CAD Manager's job??????? He can certainly pay attention to changes on the Wiki --they would not be anonymous on an intranet, and most probably a wiki could be set up to notify him/her of any edits or new pages being added. If a problem user is adding spurious bad information, then he's easily identified and a one-to-one discussion can be held to iron out the problem.
A basic Help/Standards web site with a single author has update and currency issues. It's _hard_ to take the time to write between getting jobs out the door, solving problems, doing development, handling management expectations, kicking the cat, etc etc etc. That author becomes a bottleneck just as much as a gateway. It's an approach that minimizes the potential for problem edits, but also reduces the quality and public 'ownership' of the product. It can't get any better than he alone can make it, and it's his -- not the users.
Compiled HTML help is convenient to access, but a pain to update - since the files won't run off a network they need to be loaded on each PC. A Wiki really gives you the best of both worlds (and can certainly include static or protected pages that hold your cast-in-stone requirements)