Bumper support will not work now that I think about it as the floor piece I need to remove is above. If I understand this right it's like a sandwich. Frame...wood floor....aluminum channel... So I'll have to come up with another support when its time to put the floor in.
Today's mission is to remove the next section of lower interior panels to expose the floor / channel further, take out more floor to the 6 foot mark, cleanup frame to that point and go to home depot. I need to find a local welder. I have this feeling the shell is going to end up off yet. It's hard to resist the full monty once you get going.