Is there a way to install it without going under the windshield? Not digging having to remove the windshield every time you want to do something to the roof. Maybe put an additional trim piece to hide a messy edge?
I suppose a trim piece is doable but the windshield removal provides acces to the edge where the headliner materials folds over (ever so slightly). It provides a better "anchor" for the material as it gets stretched back, a bit more secure.