The "fun" with replacing the inner cowl comes in to play where you have 3 panel flanges sandwiched together
1) The lower flange of the inner cowl.
2) The side flange of the floor.
3) The side flange of the rocker panel.
To do it correctly (ie as original), you need to first get the floor section out of the way so that you can remove the lower flange of the inner cowl from the rocker panel.
After that, the cab pretty much puts itself back together...
Well, except for rusted out hinge pillar, the rusted out inner-to-outer cowl, and the rusted out rocker panel.
"But other than that, smooth sailing." Just make sure to keep saying that to yourself. It helps.
