Frame rail replacement help

as always these old cars are full of surprises....
When we first started tearing the car down we knew the front clip had to be replaced (which came with the car) and the floor pans. Once we had the car welded to our jig we removed the old clip and floor. The rear frame rails were also going to be replaced but we figured we’d do the front end first so we could get all our measurements from them to place front clip. Well now we can see that the inner rockers are toasted too. We ordered new ones from AMD along with a truck full of other stuff too. The inner rockers run from pretty much wheel well to wheel well....so what do we do. Do we cut the new rockers in half and continue to put in new firewall and front clip then move to back? Or do we remove the leaf spring brackets (getting new ones of those to....might as well going this far!) and replace the whole rocker in one piece. I’m just worried keeping all the measurements true and everything in line.
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