Cab corners

[Matt_50]

I've been patching up the cab lately and I started cleaning up my driver side cab corner today. Both sides need to be done and when I feel inside the inner is rusted too.

I've been trying to find a good walk through for the corners. Something detailed and with good pictures before I start cutting it up. Are the inner and outer welded together? Is there any reason I shouldn't put in corners on the inside to have a flat floor instead of the pockets?