Here's a video I just made of how I installed my one piece headliner in my 1970 Challenger using the replacement headliner from SE Headliners. I hope this helps.
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:wrenching: https://youtu.be/n2qhHo3bp_0?si=HJ3HGkTdvYSH64wE
Very helpful.
Great job
The reproduction boards are awesome, only two issues, the material is not correct and you need a couple inches of overhang to hide the small gap between the board and garnish molding and sail panel. The correct material is available, the extra material goes under all the molding and sail panels to be correct. I've watched Mike at BEA Restorations do a couple on customer cars, one Challenger and one Cuda, that's almost the very first thing he puts on the body after paint. What he did was flip the car up-side-down and lay the board in and install coat hooks, sun visors, shoulder belt holders and overhead console instead of trying to hold it up for installation.