Start on the Notch:
First I removed the shock crossmember (kinda dark, I know):
I had previously welded in this crossmember in front of the tank to add frame rigidity. At this point I though about removing it but decided there was no need o take it out. I would just have to make the notch fit around it:
Positioning upper plates; I used this bar to set them level in reference to each other:
Here's where the driver's side ended up You can see where the frame had to be trimmed to get the inner plate to side flat against the rail:
Test fitting the inner plate after making a template and trimming it to fit around that crossmember:
Burned it in:
Welded the inside as well while I had access: