Yes yes and yes:rolleyes:
You MIGHT be able to disconnect the door glass and lower it into the door cavity, to allow the vent frame to be removed.
I recently replaced my convert glass, I found that removing the door glass was streight forward, the vent came out easy enough, window regulator easy.
Putting everything back easy, getting it adjusted, HARD!
The felts (wiskers) can be removed with glass in, lower the down stop a lot, to gain access.
Get the factory service manual there are procedures there
