68 barracuda fastback rear glass installation

I've never owned a fastback Barracuda of my own, but have worked on a couple; so forgive any ignorance I may show...
But can't you just put in the window seal, install the rear interior trim, and then install the glass and lockstrip? even if you had to leave the interior trim somewhat loose to let the gasket move around a little, you should be able to finish tightening it after the glass installation is complete.