John,
Negative on the window trim being installed, prior to the glass.
The chrome bead spreads the rubber, and makes the installation of the
glass all the more difficult.
Why would one place a locker bead in the moulding prior to the
installation of the windshield?
It would make the job all the more of a task.
With the moulding tool, and a little WD-40 the trim  almost flies in
place, and with the glasss installed, it makes the job all the easier.

Later,

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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)