Sequence of sheet metal replacement

[69Mach1 M code 5]

I'm going to be replacing several structural components of the undercarriage and wanted to check on the proper sequence of replacement based on feedback from guys that have been through this glorious exercise in fortitude.

I'll be replacing the torque boxes, toe boards, floor pan, and floor supports. Is this the proper sequence?

[Ridge Runner 918]

With everything cut out ,floor supports first ,then torque box ,then floor 

[69Mach1 M code 5]

Thanks.

[Midlife 744]

Try to remove one piece at a time and then replace it.  If you remove too many items before replacement, the car may likely fold in half.  Many people weld in square or tube supports to keep the car aligned.

[Ridge Runner 918]

You will have to have the torque box out to remove the floor support and the floor needs to be out to do any of it ,but yes ,support the frame rails and the rockers it is best to have atleast 8 supports / jack stands ,frame rails ,in the front each side at the rear of the frame rail just before the torque box the rocker just behind the torque box and either the rear of the rocker or the end of the rear frame rail 

[69Mach1 M code 5]

I purchased the two piece torque boxes based on the recommendations of web reviews sometimes making it easier to fit into place. 

The one detail I'm not sure about; after the two panels are welded together as well as to the rocker / floor support / subframe, is the top of the box where the two torque box panels join then welded to the firewall / toe board? I see several spot welds where the toe board is welded to the angled panel of the torque box about half way down but I'm not sure about the top. 

I haven't started cutting yet but am just planning things out to do it right.