Just wondering.........
Prior to paint I removed the rear pop out window glass on my early 1967 Kadett Rallye. That wasn't too bad....it's held in with rubber adhesive in to the long "hinge" on the front edge. But I looked everywhere trying to see how you would actually remove that footlong "hinge" from the B pillar post to then be able to remove the aluminum window surround trim. Made no sense on how either the hinged piece (which appears to be held in by a non-removable hard plastic hinge piece inserted into the B post itself), could be removed without screwing up the piece, or how the aluminum trim could be removed without taking that hinged retainer off!
The aluminum drip rail was a lot easier to remove on a Kadett than it was on my Manta. The Kadett's rail is held on by a few small rivets that you can remove with a punch and then carefully, starting at the rear, twist up and off the rail.