Detroit Speed 4-point roll bar

[RdHuggr68]

I just got my roll bar from Detroit Speed, I am installing it in a 68 Camaro that is completely gutted including glass. Has anyone installed one and tacked the rear down bars in and been able to remove the roll bar assembly and finished the welding outside the car? It says in directions it is possible with some models, not being specific. Any suggestions are appreciated.
Kevin