[PGSigns]

Here is how I do a door.
Build up the entire vent window assembly.
tape up the door.
Put in the vent and put just the top and bottom screw in it.
Put the main window felt in starting from the vent end.
Put the wiper felts in.
Pull the vent out.
Put the window regulator in.
Install the door glass with the regulator about half way up.
Roll the door glass down with it pushed into the felt.
Install the vent assembly.
No way I know of getting the glass in with the vent in place.
Jimmy