As of May 2, 2015, the road going in (to the Amasa Valley and beyond) is now in great shape- there are only one or two spots which may be impassible to passenger cars. As for the hike, there is now a trail all the way along this route (not too easy to keep in some places, but it's there). This is really an amazing route!
Thanks for the updates! I sounds like things have changed since the 1990's.