I managed to get the whole headliner out of the 1600 today.  What took me the longest was getting the sunroof out first.  It's been about 35 years since I have had to work on the sunroof so it took me a little while to remember and figure out how it all went.  However, once free of the restraints of the sunroof, a big surprise!  Apparently a rodent had gotten up there at some point and made a big nasty nest.  It must have been several years ago, but still...yuck.  A lot of the foam was in really good shape,especially in the c-pillars so no need to replace it.  The foam where the rodent was is pretty much ruined so I went to Jo-Ann  fabric and was able get the foam needed for replacement.  The one difficulty I seem to be having is removing all of the nasty old dried remnants of the windshield gaskets.  So if anyone has any suggestions, please leave in the comments.  I was also able to remove the gaskets around the rear vent windows and from the b-pillar.   They pretty much disintegrated in my hands.  But thanks to Carl Nelson at LaJolla Independent BMW Service, I have new ones on the way!  Thank you Carl!  Below are some of the pictures of today's endeavors.   Tommorow if I get the gasket material cleaned off, I plan on replacing the damaged foam and possibly starting in on the headliner.  Wish me luck!