Alignment help

[Skymortar]

Afternoon All.Im supposed to be getting my new floor in the next two weeks. My 70 has one torsion box in it.It was replaced a very long time ago and never finished.Right now I am trying to get the roof bolted down and doors hung to get it square before we cut her in half.Should I cut the existing rocker box out before I hang the doors?I have no idea if it was right when they welded it in.Or should I just button it up hang the doors and find out?I'm cutting it off regardless because I'm putting in a complete with braces front floor.Thanks,Jeremy